使用Mono Cecil注入属性调用

Question

如何将此代码注入方法Test()？

this.DialogResult = DialogResult.OK;

因此注入后的方法如下所示：

public void Test()
{
this.DialogResult = DialogResult.OK;
}

Answer 1

这将在Test方法的顶部插入赋值，前提是DialogResult字段在声明Test的相同类型中声明（否则你将不得不浏览它的层次结构来检索它）：

var module = ModuleDefinition.ReadModule ("assembly.dll");
var container = module.GetType ("Container");
var test = container.Methods.First (m => m.Name == "Test");
var field = container.Fields.First (f => f.Name == "DialogResult");

var il = test.Body.GetILProcessor ();

var first = test.Body.Instructions [0];

il.InjectBefore (first, il.Create (OpCodes.Ldarg_0));
il.InjectBefore (first, il.Create (OpCodes.Ldc_i4, (int) DialogResult.Ok));
il.InjectBefore (first, il.Create (OpCodes.Stfld, field));