How to create multiple output files from a single T4 template using Tangible Editor?

问题

I tried to follow this tutorial: http://t4-editor.tangible-engineering.com/blog/how-to-generate-multiple-output-files-from-a-single-t4-template.html

with visual studio 2015 (.Net 4.5)

Sample project with error: http://www.filedropper.com/t4fail

I created the Template1.tt with the following source:

<#@ include file="TemplateFileManagerV2.1.ttinclude" #>
<#@ Assembly Name="System.Core" #>
<#@ Assembly Name="System.Windows.Forms" #>
<#@ import namespace="System" #>
<#@ import namespace="System.IO" #>
<#@ import namespace="System.Diagnostics" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Collections" #>
<#@ import namespace="System.Collections.Generic" #> 
<#
    var manager = TemplateFileManager.Create(this);
#>

I added TemplateFileManagerV2.1.ttinclude from template gallery to my project.

Then I got an error:

'Microsoft.VisualStudio.TextTemplating.IDebugTextTemplatingEngine' is defined in an assembly that is not referenced. You must add a reference to assembly 'Microsoft.VisualStudio.TextTemplating.Interfaces.11.0, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

So I added references to

C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Microsoft.VisualStudio.TextTemplating.11.0\v4.0_11.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.TextTemplating.11.0.dll

and

C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Microsoft.VisualStudio.TextTemplating.Interfaces.11.0\v4.0_11.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.TextTemplating.Interfaces.11.0.dll

to my project, but nothing changed.

The error was in the following method inside .ttinclude

public string GetTemplateContent(string templateName, TextTemplatingSession session)
    {
        string fullName = this.Host.ResolvePath(templateName);
        string templateContent = File.ReadAllText(fullName);

        var sessionHost = this.Host as ITextTemplatingSessionHost;
        sessionHost.Session = session;

        Engine engine = new Engine();
        return engine.ProcessTemplate(templateContent, this.Host);
    }

I replaced it with

public string GetTemplateContent(string templateName, TextTemplatingSession session)
    {
        string fullName = this.Host.ResolvePath(templateName);
        string templateContent = File.ReadAllText(fullName);

        var sessionHost = this.Host as ITextTemplatingSessionHost;
        sessionHost.Session = session;

        //Engine engine = new Engine();
        return "";//engine.ProcessTemplate(templateContent, this.Host);
    }

to check if the problem is indeed in dll and got:

'Microsoft.VisualStudio.TextTemplatingA30AC8B57EFC4307E43667FCD72F5E4857F498C5224AE0D43FFC74B3A98D4FA090794EF196648D62B1BC664AFBA5EDE831067D7D1768A759EBBE83426975F7AA.GeneratedTextTransformation' does not contain a definition for 'Host' and no extension method 'Host' accepting a first argument of type 'Microsoft.VisualStudio.TextTemplatingA30AC8B57EFC4307E43667FCD72F5E4857F498C5224AE0D43FFC74B3A98D4FA090794EF196648D62B1BC664AFBA5EDE831067D7D1768A759EBBE83426975F7AA.GeneratedTextTransformation' could be found (are you missing a using directive or an assembly reference?)

It seems, that it's not.

回答1:

I remember I found an easier way to do it back in 2010, but now, after looking across the web for that method, I couldn't find it again. So, after some digging, I managed to find it in an old source code repository. Here's how I did it back then, without making use of any external file or dependency:

<#@ template debug="false" hostspecific="true" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System" #>
<#@ import namespace="System.IO" #>
<#@ output extension=".txt" #>
<#
for (Int32 i = 0; i < 10; ++i) {
#>
Content <#= i #>
<#
  // End of file.
  SaveOutput("Content" + i.ToString() + ".txt");
}
#>
<#+
private void SaveOutput(string outputFileName) {
  string templateDirectory = Path.GetDirectoryName(Host.TemplateFile);
  string outputFilePath = Path.Combine(templateDirectory, outputFileName);
  File.WriteAllText(outputFilePath, this.GenerationEnvironment.ToString()); 
  this.GenerationEnvironment.Remove(0, this.GenerationEnvironment.Length);
}
#>

Please note that I don't know who the original author of this method is. If you happen to know who he or she is, please leave a comment.

回答2:

<#@ template hostSpecific="true"#>

on top of .tt file solves everything.

回答3:

This is the documentation from Tangible Engineering:

https://t4-editor.tangible-engineering.com/blog/how-to-generate-multiple-output-files-from-a-single-t4-template.html

It requires you to include and use the Template File Manager. The steps are briefly as follows:

Obtain the file manager from their free code gallery (https://t4-editor.tangible-engineering.com/Download_T4Editor_Plus_ModelingTools.html)
Include the file manager in the main template file:
<#@ include file="TemplateFileManagerV2.1.ttinclude" #>
Instantiate a manager:
<# var manager = TemplateFileManager.Create(this); #>
Use the manager to start a new file:
<# manager.StartNewFile("Outputfile2.txt"); #>
Note that this will end a previously started file before starting the next.
Generate template code as normal (will be generated in new file until another file is started or files are processed below)
Finalize all files (will end previously started file):
<# manager.Process(); #>

Also, this method will automatically add the new files to the project.

来源：https://stackoverflow.com/questions/33575419/how-to-create-multiple-output-files-from-a-single-t4-template-using-tangible-edi

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tangible-t4-editor