SharpFileDialog/NativeFileDialog.cs at master · TheDearbear/SharpFileDialog · GitHub

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// .NET Standard 2.1 OR >= .NET Core 3.0
#if (!NETSTANDARD2_0&&NETSTANDARD2_0_OR_GREATER)||NETCOREAPP3_0_OR_GREATER
#define USE_NOTNULLWHEN
#endif

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Diagnostics.CodeAnalysis;
usingSystem.Linq;
usingSystem.Reflection;

namespaceSharpFileDialog
{
publicstaticclassNativeFileDialog
{
publicstaticboolCurrentPlatformSupported=>Provideris not null;

publicstaticINativeDialogProvider?Provider{get;set;}

staticbool_providerSearched=false;

publicstaticboolSetDefaultProvider()
{
_providerSearched=true;
varpreviousProvider=Provider;
AssemblycurrentAssembly=Assembly.GetExecutingAssembly();
IEnumerable<Type>nativeProviders=currentAssembly.GetTypes().Where(type =>type.GetInterface(nameof(INativeDialogProvider))is not null);

foreach(TypenativeProviderinnativeProviders)
{
try
{
if(Activator.CreateInstance(nativeProvider)isINativeDialogProviderprovider)
{
if(!provider.CurrentPlatformSupported)
continue;

if(Providerisnull||Provider.Priority<provider.Priority)
Provider=provider;
}
}
catch{}
}

returnProvider!=previousProvider;
}

#if USE_NOTNULLWHEN
publicstaticboolOpenDialog(Filter[]?filters,string?defaultPath,[NotNullWhen(true)]outstring?outPath)
#else
publicstaticboolOpenDialog(Filter[]?filters,string?defaultPath,outstring?outPath)
#endif
{
INativeDialogProviderprovider=EnsureProviderAvailable();

returnprovider.OpenDialog(filters,defaultPath,outoutPath);
}

#if USE_NOTNULLWHEN
publicstaticboolOpenDialogMultiple(Filter[]?filters,string?defaultPath,[NotNullWhen(true)]outstring[]?outPaths)
#else
publicstaticboolOpenDialogMultiple(Filter[]?filters,string?defaultPath,outstring[]?outPaths)
#endif
{
INativeDialogProviderprovider=EnsureProviderAvailable();

returnprovider.OpenDialogMultiple(filters,defaultPath,outoutPaths);
}

#if USE_NOTNULLWHEN
publicstaticboolSaveDialog(Filter[]?filters,string?defaultPath,[NotNullWhen(true)]outstring?outPath)
#else
publicstaticboolSaveDialog(Filter[]?filters,string?defaultPath,outstring?outPath)
#endif
{
INativeDialogProviderprovider=EnsureProviderAvailable();

returnprovider.SaveDialog(filters,defaultPath,outoutPath);
}

#if USE_NOTNULLWHEN
publicstaticboolPickFolder(string?defaultPath,[NotNullWhen(true)]outstring?outPath)
#else
publicstaticboolPickFolder(string?defaultPath,outstring?outPath)
#endif
{
INativeDialogProviderprovider=EnsureProviderAvailable();

returnprovider.PickFolder(defaultPath,outoutPath);
}

staticINativeDialogProviderEnsureProviderAvailable()
{
if(!_providerSearched)
SetDefaultProvider();

if(Providerisnull)
thrownewPlatformNotSupportedException("Dialog provider for current platform is not available!");

returnProvider;
}

publicstructFilter
{
publicstringName;
publicstring[]Extensions;
}
}
}