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.NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found #66847

Description

@nkastratovic

Description

I'm running a C# application which calls a VB class called wrapper.vb, which uses MS Word objects. This code was tried and tested and worked fine with .NET 4.8 but now breaks in .NET 5.

I have a variable: Protected m_wdApp As Object

When the class is instantiated, it calls:

Reproduction Steps

 Public Sub New()
m_wdApp = CreateObject("Word.Application")
m_wdApp.Visible = False
m_outputFormat = DOC_FORMAT
End Sub 

Expected behavior

Actual behavior

This throws the following exception
4c64q
:
Now the above would be all very fine and well, if I wasn't able to actually look at the contents of the m_wrdApp and see that yes, they are all intact and are all visible in my watch Windows
r09tg
.
Using the Immediate window, attempting to access any of these attributes from the Word object throws an error (as you'd expect).

However, if I ask VS to "add a watch" to one of the attributes, for instance this "Visible" which we currently need, it comes out with this convoluted watch name
Ip3az
:

Regression?

I should note that all of this worked fine before upgrading to .NET 5, so I'm wondering if this is either a bug or there are some new rules for dealing with late bound variables.

Known Workarounds

No response

Configuration

VB .NET 5
Windows 10
x64

Other information

No response

Metadata

Metadata

Assignees

No one assigned

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    No type

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    No projects

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      No milestone

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      None yet

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      No branches or pull requests

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all
       blocks
      (function() {
      function addCopyButtons() {
      document.querySelectorAll('pre code').forEach(function(codeBlock) {
      if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
      codeBlock.parentElement.setAttribute('data-copy-added', 'true');
      var btn = document.createElement('button');
      btn.textContent = 'Copy';
      btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
      btn.onmouseover = function() { this.style.opacity = '1'; };
      btn.onmouseout = function() { this.style.opacity = '0.7'; };
      btn.onclick = function() {
      navigator.clipboard.writeText(codeBlock.textContent).then(function() {
      btn.textContent = 'Copied!';
      setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
      });
      };
      codeBlock.parentElement.style.position = 'relative';
      codeBlock.parentElement.appendChild(btn);
      });
      }
      addCopyButtons();
      // Re-run on dynamic content
      var observer = new MutationObserver(addCopyButtons);
      observer.observe(document.body, { childList: true, subtree: true });
      })();
      }
      } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
      })();
      (function(){
      try {
      var __m = "github.com";
      var __re = new RegExp('^' + "github\\.com" + '
      .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found · Issue #66847 · dotnet/runtime · GitHub
      Skip to content

      .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found #66847

      Description

      @nkastratovic

      Description

      I'm running a C# application which calls a VB class called wrapper.vb, which uses MS Word objects. This code was tried and tested and worked fine with .NET 4.8 but now breaks in .NET 5.

      I have a variable: Protected m_wdApp As Object

      When the class is instantiated, it calls:

      Reproduction Steps

       Public Sub New()
      m_wdApp = CreateObject("Word.Application")
      m_wdApp.Visible = False
      m_outputFormat = DOC_FORMAT
      End Sub 

      Expected behavior

      Actual behavior

      This throws the following exception
      4c64q
      :
      Now the above would be all very fine and well, if I wasn't able to actually look at the contents of the m_wrdApp and see that yes, they are all intact and are all visible in my watch Windows
      r09tg
      .
      Using the Immediate window, attempting to access any of these attributes from the Word object throws an error (as you'd expect).

      However, if I ask VS to "add a watch" to one of the attributes, for instance this "Visible" which we currently need, it comes out with this convoluted watch name
      Ip3az
      :

      Regression?

      I should note that all of this worked fine before upgrading to .NET 5, so I'm wondering if this is either a bug or there are some new rules for dealing with late bound variables.

      Known Workarounds

      No response

      Configuration

      VB .NET 5
      Windows 10
      x64

      Other information

      No response

      Metadata

      Metadata

      Assignees

      No one assigned

        Type

        No type

        Projects

        No projects

          Milestone

          No milestone

          Relationships

          None yet

          Development

          No branches or pull requests

          Issue actions

          , 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found · Issue #66847 · dotnet/runtime · GitHub
          Skip to content

          .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found #66847

          Description

          @nkastratovic

          Description

          I'm running a C# application which calls a VB class called wrapper.vb, which uses MS Word objects. This code was tried and tested and worked fine with .NET 4.8 but now breaks in .NET 5.

          I have a variable: Protected m_wdApp As Object

          When the class is instantiated, it calls:

          Reproduction Steps

           Public Sub New()
          m_wdApp = CreateObject("Word.Application")
          m_wdApp.Visible = False
          m_outputFormat = DOC_FORMAT
          End Sub 

          Expected behavior

          Actual behavior

          This throws the following exception
          4c64q
          :
          Now the above would be all very fine and well, if I wasn't able to actually look at the contents of the m_wrdApp and see that yes, they are all intact and are all visible in my watch Windows
          r09tg
          .
          Using the Immediate window, attempting to access any of these attributes from the Word object throws an error (as you'd expect).

          However, if I ask VS to "add a watch" to one of the attributes, for instance this "Visible" which we currently need, it comes out with this convoluted watch name
          Ip3az
          :

          Regression?

          I should note that all of this worked fine before upgrading to .NET 5, so I'm wondering if this is either a bug or there are some new rules for dealing with late bound variables.

          Known Workarounds

          No response

          Configuration

          VB .NET 5
          Windows 10
          x64

          Other information

          No response

          Metadata

          Metadata

          Assignees

          No one assigned

            Type

            No type

            Projects

            No projects

              Milestone

              No milestone

              Relationships

              None yet

              Development

              No branches or pull requests

              Issue actions

              , 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found · Issue #66847 · dotnet/runtime · GitHub
              Skip to content

              .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found #66847

              Description

              @nkastratovic

              Description

              I'm running a C# application which calls a VB class called wrapper.vb, which uses MS Word objects. This code was tried and tested and worked fine with .NET 4.8 but now breaks in .NET 5.

              I have a variable: Protected m_wdApp As Object

              When the class is instantiated, it calls:

              Reproduction Steps

               Public Sub New()
              m_wdApp = CreateObject("Word.Application")
              m_wdApp.Visible = False
              m_outputFormat = DOC_FORMAT
              End Sub 

              Expected behavior

              Actual behavior

              This throws the following exception
              4c64q
              :
              Now the above would be all very fine and well, if I wasn't able to actually look at the contents of the m_wrdApp and see that yes, they are all intact and are all visible in my watch Windows
              r09tg
              .
              Using the Immediate window, attempting to access any of these attributes from the Word object throws an error (as you'd expect).

              However, if I ask VS to "add a watch" to one of the attributes, for instance this "Visible" which we currently need, it comes out with this convoluted watch name
              Ip3az
              :

              Regression?

              I should note that all of this worked fine before upgrading to .NET 5, so I'm wondering if this is either a bug or there are some new rules for dealing with late bound variables.

              Known Workarounds

              No response

              Configuration

              VB .NET 5
              Windows 10
              x64

              Other information

              No response

              Metadata

              Metadata

              Assignees

              No one assigned

                Type

                No type

                Projects

                No projects

                  Milestone

                  No milestone

                  Relationships

                  None yet

                  Development

                  No branches or pull requests

                  Issue actions

                  , 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found · Issue #66847 · dotnet/runtime · GitHub
                  Skip to content

                  .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found #66847

                  Description

                  @nkastratovic

                  Description

                  I'm running a C# application which calls a VB class called wrapper.vb, which uses MS Word objects. This code was tried and tested and worked fine with .NET 4.8 but now breaks in .NET 5.

                  I have a variable: Protected m_wdApp As Object

                  When the class is instantiated, it calls:

                  Reproduction Steps

                   Public Sub New()
                  m_wdApp = CreateObject("Word.Application")
                  m_wdApp.Visible = False
                  m_outputFormat = DOC_FORMAT
                  End Sub 

                  Expected behavior

                  Actual behavior

                  This throws the following exception
                  4c64q
                  :
                  Now the above would be all very fine and well, if I wasn't able to actually look at the contents of the m_wrdApp and see that yes, they are all intact and are all visible in my watch Windows
                  r09tg
                  .
                  Using the Immediate window, attempting to access any of these attributes from the Word object throws an error (as you'd expect).

                  However, if I ask VS to "add a watch" to one of the attributes, for instance this "Visible" which we currently need, it comes out with this convoluted watch name
                  Ip3az
                  :

                  Regression?

                  I should note that all of this worked fine before upgrading to .NET 5, so I'm wondering if this is either a bug or there are some new rules for dealing with late bound variables.

                  Known Workarounds

                  No response

                  Configuration

                  VB .NET 5
                  Windows 10
                  x64

                  Other information

                  No response

                  Metadata

                  Metadata

                  Assignees

                  No one assigned

                    Type

                    No type

                    Projects

                    No projects

                      Milestone

                      No milestone

                      Relationships

                      None yet

                      Development

                      No branches or pull requests

                      Issue actions

                      , 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found · Issue #66847 · dotnet/runtime · GitHub
                      Skip to content

                      .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found #66847

                      Description

                      @nkastratovic

                      Description

                      I'm running a C# application which calls a VB class called wrapper.vb, which uses MS Word objects. This code was tried and tested and worked fine with .NET 4.8 but now breaks in .NET 5.

                      I have a variable: Protected m_wdApp As Object

                      When the class is instantiated, it calls:

                      Reproduction Steps

                       Public Sub New()
                      m_wdApp = CreateObject("Word.Application")
                      m_wdApp.Visible = False
                      m_outputFormat = DOC_FORMAT
                      End Sub 

                      Expected behavior

                      Actual behavior

                      This throws the following exception
                      4c64q
                      :
                      Now the above would be all very fine and well, if I wasn't able to actually look at the contents of the m_wrdApp and see that yes, they are all intact and are all visible in my watch Windows
                      r09tg
                      .
                      Using the Immediate window, attempting to access any of these attributes from the Word object throws an error (as you'd expect).

                      However, if I ask VS to "add a watch" to one of the attributes, for instance this "Visible" which we currently need, it comes out with this convoluted watch name
                      Ip3az
                      :

                      Regression?

                      I should note that all of this worked fine before upgrading to .NET 5, so I'm wondering if this is either a bug or there are some new rules for dealing with late bound variables.

                      Known Workarounds

                      No response

                      Configuration

                      VB .NET 5
                      Windows 10
                      x64

                      Other information

                      No response

                      Metadata

                      Metadata

                      Assignees

                      No one assigned

                        Type

                        No type

                        Projects

                        No projects

                          Milestone

                          No milestone

                          Relationships

                          None yet

                          Development

                          No branches or pull requests

                          Issue actions

                          , 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found · Issue #66847 · dotnet/runtime · GitHub
                          Skip to content

                          .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found #66847

                          Description

                          @nkastratovic

                          Description

                          I'm running a C# application which calls a VB class called wrapper.vb, which uses MS Word objects. This code was tried and tested and worked fine with .NET 4.8 but now breaks in .NET 5.

                          I have a variable: Protected m_wdApp As Object

                          When the class is instantiated, it calls:

                          Reproduction Steps

                           Public Sub New()
                          m_wdApp = CreateObject("Word.Application")
                          m_wdApp.Visible = False
                          m_outputFormat = DOC_FORMAT
                          End Sub 

                          Expected behavior

                          Actual behavior

                          This throws the following exception
                          4c64q
                          :
                          Now the above would be all very fine and well, if I wasn't able to actually look at the contents of the m_wrdApp and see that yes, they are all intact and are all visible in my watch Windows
                          r09tg
                          .
                          Using the Immediate window, attempting to access any of these attributes from the Word object throws an error (as you'd expect).

                          However, if I ask VS to "add a watch" to one of the attributes, for instance this "Visible" which we currently need, it comes out with this convoluted watch name
                          Ip3az
                          :

                          Regression?

                          I should note that all of this worked fine before upgrading to .NET 5, so I'm wondering if this is either a bug or there are some new rules for dealing with late bound variables.

                          Known Workarounds

                          No response

                          Configuration

                          VB .NET 5
                          Windows 10
                          x64

                          Other information

                          No response

                          Metadata

                          Metadata

                          Assignees

                          No one assigned

                            Type

                            No type

                            Projects

                            No projects

                              Milestone

                              No milestone

                              Relationships

                              None yet

                              Development

                              No branches or pull requests

                              Issue actions

                              , 'i'); if (__m === '*' || __re.test(location.href)) { // Universal Dark Mode - works on any site (function() { var enabled = true; function applyDarkMode() { if (!enabled) return; // Create style element if it doesn't exist var style = document.getElementById('universal-dark-mode-style'); if (!style) { style = document.createElement('style'); style.id = 'universal-dark-mode-style'; document.head.appendChild(style); } // Dark mode CSS - inverts colors but preserves images/video style.textContent = ' /* Invert everything except media */ html { filter: invert(1) hue-rotate(180deg) !important; background: #1a1a2e !important; } /* Restore images, videos, iframes, canvas */ img, video, iframe, canvas, svg, picture, [style*="background-image"] { filter: invert(1) hue-rotate(180deg) !important; } /* Preserve specific elements that should not be inverted */ .no-dark-mode, .no-dark-mode *, [data-theme="light"], [data-theme="light"], .ace_editor, .ace_editor *, .CodeMirror, .CodeMirror *, .monaco-editor, .monaco-editor *, .markdown-body pre, .markdown-body pre *, .highlight, .highlight *, pre code, pre code * { filter: none !important; } /* Fix common UI elements */ .modal, .popup, .dropdown-menu, .tooltip, .popover { filter: invert(1) hue-rotate(180deg) !important; background: #2d2d44 !important; border-color: #444 !important; } /* Scrollbars */ ::-webkit-scrollbar { background: #1a1a2e !important; } ::-webkit-scrollbar-thumb { background: #444 !important; } ::-webkit-scrollbar-thumb:hover { background: #555 !important; } /* Selection */ ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; } ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; } '; } function removeDarkMode() { var style = document.getElementById('universal-dark-mode-style'); if (style) style.remove(); } // Toggle with Alt+Shift+D document.addEventListener('keydown', function(e) { if (e.altKey && e.shiftKey && e.key === 'D') { e.preventDefault(); enabled = !enabled; if (enabled) { applyDarkMode(); console.log('[Universal Dark Mode] Enabled'); } else { removeDarkMode(); console.log('[Universal Dark Mode] Disabled'); } } }); // Apply on load applyDarkMode(); // Re-apply on dynamic content var observer = new MutationObserver(function(mutations) { if (enabled && !document.getElementById('universal-dark-mode-style')) { applyDarkMode(); } }); observer.observe(document.head, { childList: true }); console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle'); })(); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found · Issue #66847 · dotnet/runtime · GitHub
                              Skip to content

                              .NET 5 VB Late bound variables unavailable at run time due to Public member 'Visible' on type 'Application' not found #66847

                              Description

                              @nkastratovic

                              Description

                              I'm running a C# application which calls a VB class called wrapper.vb, which uses MS Word objects. This code was tried and tested and worked fine with .NET 4.8 but now breaks in .NET 5.

                              I have a variable: Protected m_wdApp As Object

                              When the class is instantiated, it calls:

                              Reproduction Steps

                               Public Sub New()
                              m_wdApp = CreateObject("Word.Application")
                              m_wdApp.Visible = False
                              m_outputFormat = DOC_FORMAT
                              End Sub 

                              Expected behavior

                              Actual behavior

                              This throws the following exception
                              4c64q
                              :
                              Now the above would be all very fine and well, if I wasn't able to actually look at the contents of the m_wrdApp and see that yes, they are all intact and are all visible in my watch Windows
                              r09tg
                              .
                              Using the Immediate window, attempting to access any of these attributes from the Word object throws an error (as you'd expect).

                              However, if I ask VS to "add a watch" to one of the attributes, for instance this "Visible" which we currently need, it comes out with this convoluted watch name
                              Ip3az
                              :

                              Regression?

                              I should note that all of this worked fine before upgrading to .NET 5, so I'm wondering if this is either a bug or there are some new rules for dealing with late bound variables.

                              Known Workarounds

                              No response

                              Configuration

                              VB .NET 5
                              Windows 10
                              x64

                              Other information

                              No response

                              Metadata

                              Metadata

                              Assignees

                              No one assigned

                                Type

                                No type

                                Projects

                                No projects

                                  Milestone

                                  No milestone

                                  Relationships

                                  None yet

                                  Development

                                  No branches or pull requests

                                  Issue actions