我用Reflection.Emit我的代码在运行时编写了一些用于创建类和属性的方法：
public class DynamicLibraryProperties
{
public string PropName { get; set; }
public Type PropType { get; set; }
public string DefaultValue { get; set; }
}
public class GenerateDynamicClass
{
public static void GenerateLegacyStructureObject(string libraryName, string className, List<DynamicLibraryProperties> properties)
{
ILGenerator ilgen = default(ILGenerator);
string library = string.Concat(libraryName, ".dll");
AssemblyBuilder asmBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(new AssemblyName(libraryName), AssemblyBuilderAccess.RunAndSave);
ModuleBuilder modBuilder = asmBuilder.DefineDynamicModule(libraryName, library);
TypeBuilder legacyBuilder = modBuilder.DefineType(string.Concat(libraryName, ".", className), TypeAttributes.Class | TypeAttributes.Public);
//Field Builder - Based on number of months add so many fields
foreach (DynamicLibraryProperties p in properties)
{
FieldBuilder field = legacyBuilder.DefineField(string.Concat("_", p.PropName), p.PropType, FieldAttributes.Private);
PropertyBuilder nameProp = legacyBuilder.DefineProperty(p.PropName, PropertyAttributes.HasDefault, p.PropType, null);
Type[] types = new Type[] { p.PropType };
dynamic typeConvertor = TypeDescriptor.GetConverter(p.PropType);
dynamic defaultValue = typeConvertor.ConvertFromString(p.DefaultValue);
ConstructorInfo ctor = typeof(DefaultValueAttribute).GetConstructor(types);
CustomAttributeBuilder customAttrib = new CustomAttributeBuilder(ctor, new object[] { defaultValue });
nameProp.SetCustomAttribute(customAttrib);
MethodAttributes getAttr = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName;
MethodBuilder getNameBuilder = legacyBuilder.DefineMethod(string.Concat("get_", p.PropName), getAttr, p.PropType, Type.EmptyTypes);
ilgen = getNameBuilder.GetILGenerator(); ilgen.Emit(OpCodes.Ldarg_0);
ilgen.Emit(OpCodes.Ldfld, field);
ilgen.Emit(OpCodes.Ret);
MethodBuilder setNameBuilder = legacyBuilder.DefineMethod(string.Concat("set_", p.PropName), getAttr, null, new Type[] { p.PropType });
ilgen = setNameBuilder.GetILGenerator();
ilgen.Emit(OpCodes.Ldarg_0);
ilgen.Emit(OpCodes.Ldarg_1);
ilgen.Emit(OpCodes.Stfld, field); ilgen.Emit(OpCodes.Ret);
nameProp.SetGetMethod(getNameBuilder);
nameProp.SetSetMethod(setNameBuilder);
}
Type objType = Type.GetType("System.Object");
ConstructorInfo objCtor = objType.GetConstructor(Type.EmptyTypes);
ilgen.Emit(OpCodes.Ldarg_0);
ilgen.Emit(OpCodes.Call, objCtor);
ilgen.Emit(OpCodes.Ret);
legacyBuilder.CreateType();
asmBuilder.Save(library);
}
}
并使用这样的代码
List<DynamicLibraryProperties> props = new List<DynamicLibraryProperties>();
props.Add(new DynamicLibraryProperties
{
PropName = "201203", PropType = typeof(float),DefaultValue = "0"
});
props.Add(new DynamicLibraryProperties { PropName = "201204", PropType = typeof(float) ,DefaultValue = "0"});
GenerateDynamicClass.GenerateLegacyStructureObject("test", "test", props);
现在我想创建Test类的实例并为属性值设置值，但是我不知道该怎么做，请帮助我，谢谢大家。
您可以Activator.CreateInstance为此使用Type测试类。如下更改方法。
public static Type GenerateLegacyStructureObject(string libraryName, string className, List<DynamicLibraryProperties> properties)
{
//your code
Type t = legacyBuilder.CreateType();
asmBuilder.Save(library);
return t;
}
然后像这样使用它
Type testType = GenerateDynamicClass.GenerateLegacyStructureObject("test", "test", props);
object test = Activator.CreateInstance(testType);
希望这可以帮助
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我来说两句