项目结构调整

Others/gong-wpf-dragdrop/src/Directory.build.props

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+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+    <!-- Project properties -->
+    <PropertyGroup>
+        <TargetFrameworks>net45;net46;netcoreapp3.0</TargetFrameworks>
+        <AppendTargetFrameworkToOutputPath>true</AppendTargetFrameworkToOutputPath>
+        <GenerateDocumentationFile>false</GenerateDocumentationFile>
+        <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+        <LangVersion>latest</LangVersion>
+        <DebugSymbols>true</DebugSymbols>
+        <DebugType>full</DebugType>
+        <NoWarn>$(NoWarn);CS1591</NoWarn>
+        <NoError>$(NoError);CS1591</NoError>
+        <UseWPF>true</UseWPF>
+    </PropertyGroup>
+
+    <!-- Add the references for all projects and targets -->
+    <ItemGroup>
+        <PackageReference Include="JetBrains.Annotations" Version="2019.*" PrivateAssets="All" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <None Remove="**\*.png;**\*.jpg;**\*.ico" />
+        <Resource Include="**\*.png;**\*.jpg;**\*.ico" />
+    </ItemGroup>
+
+    <!-- SourceLink -->
+    <PropertyGroup>
+        <!-- Optional: Declare that the Repository URL can be published to NuSpec -->
+        <PublishRepositoryUrl>true</PublishRepositoryUrl>
+        <!-- Optional: Embed source files that are not tracked by the source control manager to the PDB -->
+        <EmbedUntrackedSources>true</EmbedUntrackedSources>
+        <!-- Optional: Include PDB in the built .nupkg -->
+        <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
+        <!-- https://github.com/dotnet/sourcelink/blob/master/docs/README.md#embedallsources -->
+        <!-- <EmbedAllSources>true</EmbedAllSources>-->
+    </PropertyGroup>
+
+</Project>