Use custom ApplyTokenReplacements task

src/Directory.Build.targets

@@ -1,7 +1,79 @@
 <Project>
+  <UsingTask TaskName="ApplyTokenReplacements" TaskFactory="CodeTaskFactory" AssemblyName="Microsoft.Build.Tasks.Core">
+    <ParameterGroup>
+      <InputLines ParameterType="Microsoft.Build.Framework.ITaskItem[]" Required="true" />
+      <Tokens ParameterType="Microsoft.Build.Framework.ITaskItem[]" Required="true" />
+      <OutputLines ParameterType="Microsoft.Build.Framework.ITaskItem[]" Output="true" />
+    </ParameterGroup>
+    <Task>
+      <Reference Include="System.Text.RegularExpressions" />
+      <Code Type="Fragment" Language="cs">
+        <![CDATA[
+
+        var output = new List<ITaskItem>();
+ 
+        foreach (var line in InputLines)
+
+        {
+
+            string text = line.ItemSpec;
+ 
+            foreach (var token in Tokens)
+
+            {
+
+                // Hole den Token-Namen (z. B. Box13_ClientId)
+
+                string tokenName = token.ItemSpec;
+                
+                // Skip if tokenName is null or empty
+                if (string.IsNullOrEmpty(tokenName))
+                  continue;
+                
+                Log.LogMessage(MessageImportance.High, "Token name: "+tokenName);
+ 
+               Log.LogMessage(MessageImportance.High, "Token: "+ token);
+ 
+                // Hole den tatsächlichen Wert des Tokens, der ersetzt werden soll
+
+                string replacementValue = token.GetMetadata("ReplacementValue");
+               Log.LogMessage(MessageImportance.High, "replacementValue: "+ replacementValue);
+ 
+                // Ersetze das Token durch den Wert 
+
+                if (!string.IsNullOrEmpty(replacementValue))
+
+                {
+
+                    string placeholder = "$"+ "{"+tokenName+"}";  // Token-Format wie $(Box13_ClientId)
+                    
+                    Log.LogMessage(MessageImportance.High, "placeholder: "+ placeholder);
+
+                    text = text.Replace(placeholder, replacementValue);
+
+                }
+
+            }
+ 
+            output.Add(new Microsoft.Build.Utilities.TaskItem(text));
+
+        }
+ 
+        OutputLines = output.ToArray();
+
+      ]]>
+      </Code>
+    </Task>
+  </UsingTask>
+
+
+
+
+
+<!--
   <UsingTask TaskName="MSBuild.Community.Tasks.TemplateFile"
              AssemblyFile="$(NuGetPackageRoot)msbuildtasks/1.5.0.235/tools/MSBuild.Community.Tasks.dll" />
-
+-->
   <PropertyGroup Condition="Exists('$(ProjectDir)$(ProjectName).Credentials.template')">
     <MSBuildCommunityTasksPath>$(NuGetPackageRoot)msbuildtasks/1.5.0.235/tools/</MSBuildCommunityTasksPath>
   </PropertyGroup>
@@ -10,6 +82,73 @@
 
   <Target Name="ProcessTemplates" BeforeTargets="PrepareForBuild" Condition="Exists('$(ProjectDir)$(ProjectName).Credentials.template')">
     <Message Text="Processing: $(ProjectDir)$(ProjectName).Credentials.template" Importance="high"/>
-    <TemplateFile Template="$(ProjectDir)$(ProjectName).Credentials.template" OutputFilename="$(ProjectDir)$(ProjectName).Credentials.cs" Tokens="@(Tokens)" />
+
+
+    <ReadLinesFromFile File="$(ProjectDir)$(ProjectName).Credentials.template">
+      <Output TaskParameter="Lines" ItemName="TemplateLines" />
+    </ReadLinesFromFile>
+
+    <ApplyTokenReplacements InputLines="@(TemplateLines)" Tokens="@(Tokens)">
+      <Output TaskParameter="OutputLines" ItemName="ProcessedLines" />
+    </ApplyTokenReplacements>
+
+    <WriteLinesToFile
+      File="$(ProjectDir)$(ProjectName).Credentials.cs"
+      Lines="@(ProcessedLines)"
+      Overwrite="true" />
+
+    <!-- 
+    
+    <ReadLinesFromFile File="$(ProjectDir)$(ProjectName).Credentials.template">
+      <Output TaskParameter="Lines" ItemName="TemplateLines" />
+    </ReadLinesFromFile>
+ 
+    <Message Text="Ersetze Umgebungsvariablen in Template..." Importance="High" />
+ 
+    <ItemGroup>
+      <ProcessedLines>
+        <Output>$([System.Text.RegularExpressions.Regex]::Replace('%(TemplateLines.Identity)', '\{\{API_KEY\}\}', '$(API_KEY)'))</Output>
+      </ProcessedLines>
+    </ItemGroup>
+ 
+    <WriteLinesToFile
+      File="$(ProjectDir)$(ProjectName).Credentials.cs"
+      Lines="@(ProcessedLines->'%(Output)')"
+      Overwrite="true" />
+-->
+
+    <!--  
+    
+    <ReadLinesFromFile File="$(ProjectDir)$(ProjectName).Credentials.template">
+<Output TaskParameter="Lines" ItemName="TemplateLines" />
+</ReadLinesFromFile>
+ 
+  <ItemGroup>
+<ProcessedLines Include="@(TemplateLines)">
+<Output1>$([System.String]::Copy('%(Identity)'))</Output1>
+</ProcessedLines>
+</ItemGroup>
+ 
+<ItemGroup>
+<ProcessedLines>
+<Output1>$([System.Text.RegularExpressions.Regex]::Replace('%(Output1)', '\$\{Photobucket_ClientId\}', '$(Photobucket_ClientId)'))</Output1>
+<Output1>$([System.Text.RegularExpressions.Regex]::Replace('%(Output1)', \$\{Photobucket_ClientSecret\}', '$(Photobucket_ClientSecret)'))</Output1>
+</ProcessedLines>
+</ItemGroup>
+ 
+  <WriteLinesToFile
+    File="$(ProjectDir)$(ProjectName).Credentials.cs"
+    Lines="@(ProcessedLines->'%(Output1)')"
+    Overwrite="true" />
+    
+  
+-->
+
+
+
   </Target>
 </Project>
+
+
+
+