C# 通过类型名字符串获取基础类型进行方法调用

 switch (readtype)
 {
                        case "float":
                            string targettype = "System.Single";
                            convertvalue = AppDomain.CurrentDomain.GetAssemblies().First( ).GetType(targettype) .InvokeMember("Parse", BindingFlags.InvokeMethod | BindingFlags.Static | BindingFlags.Public,
            null,
            null,
            new object[] { convertvalue.ToString() });
                            convertvalue = float.Parse(convertvalue.ToString());
                            break;
}