使用 Mono.Cecil 注入 generatedCodeAttribute

发布于 2024-10-12 12:34:18 字数 590 浏览 3 评论 0原文

我正在使用 Mono.Cecil 操作我的 .net 2.0 程序集。操作后，我想通过注入模块属性将程序集标记为已处理。

var stringType = _module.Import(typeof(string));
var baseCtor = _module.Import(typeof(GeneratedCodeAttribute).GetConstructor(new[] { typeof(string), typeof(string) }));
var result = new CustomAttribute(baseCtor);
result.ConstructorArguments.Add(new CustomAttributeArgument(stringType, "ProcessedBySomething"));
result.ConstructorArguments.Add(new CustomAttributeArgument(stringType, "1.0"));

保存程序集后，它变得依赖于 .net 4.0，因为操作应用程序是用 .net 4.0 编写的。 GenerationCodeAttribute 存在于.net 2.0 中，那么我做错了什么？

原文

I'm manupulating my .net 2.0 assemblies with Mono.Cecil.
After manipulation I want to mark assembly as processed by injecting a module attribute

var stringType = _module.Import(typeof(string));
var baseCtor = _module.Import(typeof(GeneratedCodeAttribute).GetConstructor(new[] { typeof(string), typeof(string) }));
var result = new CustomAttribute(baseCtor);
result.ConstructorArguments.Add(new CustomAttributeArgument(stringType, "ProcessedBySomething"));
result.ConstructorArguments.Add(new CustomAttributeArgument(stringType, "1.0"));

After saving the assembly it become dependent on .net 4.0, since manipulating app is written in .net 4.0.
GeneratedCodeAttribute exists in .net 2.0, so what am I doing wrong?

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新一帅帅 2024-10-19 12:34:18

你猜对了。由于操作应用程序在 .net 4.0 上运行，typeof 是运行时功能，因此它将返回当前运行时版本的类型。

要解决此问题，最简单的方法是为您正在修改的模块引用的 mscorlib 版本创建引用，使用 Cecil 打开程序集。你的代码将变成：

var stringType = _module.TypeSystem.String;
var corlib = (AssemblyNameReference) _module.TypeSystem.Corlib;
var system = _module.AssemblyResolver.Resolve (new AssemblyNameReference ("System", corlib.Version) {
    PublicKeyToken = corlib.PublicKeyToken,
});
var generatedCodeAttribute = system.MainModule.GetType ("System.CodeDom.Compiler.GeneratedCodeAttribute");
var generatedCodeCtor = generatedCodeAttribute.Methods.First (m => m.IsConstructor && m.Parameters.Count == 2);

var result = new CustomAttribute (_module.Import (generatedCodeCtor));
result.ConstructorArguments.Add(new CustomAttributeArgument(stringType, "ProcessedBySomething"));
result.ConstructorArguments.Add(new CustomAttributeArgument(stringType, "1.0"));

You're guessing right. Since the manipulating application is running on .net 4.0, typeof being a runtime feature, it will return a type for the current runtime version.

To fix it, the simple thing to do is to create references for the mscorlib version referenced by the module you're modifying, using Cecil to open the assembly. Your code would become:

var stringType = _module.TypeSystem.String;
var corlib = (AssemblyNameReference) _module.TypeSystem.Corlib;
var system = _module.AssemblyResolver.Resolve (new AssemblyNameReference ("System", corlib.Version) {
    PublicKeyToken = corlib.PublicKeyToken,
});
var generatedCodeAttribute = system.MainModule.GetType ("System.CodeDom.Compiler.GeneratedCodeAttribute");
var generatedCodeCtor = generatedCodeAttribute.Methods.First (m => m.IsConstructor && m.Parameters.Count == 2);

var result = new CustomAttribute (_module.Import (generatedCodeCtor));
result.ConstructorArguments.Add(new CustomAttributeArgument(stringType, "ProcessedBySomething"));
result.ConstructorArguments.Add(new CustomAttributeArgument(stringType, "1.0"));

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