本文整理汇总了C#中System.Reflection.Emit.DynamicMethod类的典型用法代码示例。如果您正苦于以下问题:C# DynamicMethod类的具体用法?C# DynamicMethod怎么用?C# DynamicMethod使用的例子?那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
DynamicMethod类属于System.Reflection.Emit命名空间,在下文中一共展示了DynamicMethod类的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于我们的系统推荐出更棒的C#代码示例。
示例1: HelloDelegate
//引入命名空间
using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Globalization;
public class Test
{
// Declare a delegate type that can be used to execute the completed
// dynamic method.
private delegate int HelloDelegate(string msg, int ret);
public static void Main()
{
// Create an array that specifies the types of the parameters
// of the dynamic method. This dynamic method has a String
// parameter and an Integer parameter.
Type[] helloArgs = {typeof(string), typeof(int)};
// Create a dynamic method with the name "Hello", a return type
// of Integer, and two parameters whose types are specified by
// the array helloArgs. Create the method in the module that
// defines the String class.
DynamicMethod hello = new DynamicMethod("Hello",
typeof(int),
helloArgs,
typeof(string).Module);
// Create an array that specifies the parameter types of the
// overload of Console.WriteLine to be used in Hello.
Type[] writeStringArgs = {typeof(string)};
// Get the overload of Console.WriteLine that has one
// String parameter.
MethodInfo writeString = typeof(Console).GetMethod("WriteLine",
writeStringArgs);
// Get an ILGenerator and emit a body for the dynamic method,
// using a stream size larger than the IL that will be
// emitted.
ILGenerator il = hello.GetILGenerator(256);
// Load the first argument, which is a string, onto the stack.
il.Emit(OpCodes.Ldarg_0);
// Call the overload of Console.WriteLine that prints a string.
il.EmitCall(OpCodes.Call, writeString, null);
// The Hello method returns the value of the second argument;
// to do this, load the onto the stack and return.
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Ret);
// Add parameter information to the dynamic method. (This is not
// necessary, but can be useful for debugging.) For each parameter,
// identified by position, supply the parameter attributes and a
// parameter name.
hello.DefineParameter(1, ParameterAttributes.In, "message");
hello.DefineParameter(2, ParameterAttributes.In, "valueToReturn");
// Create a delegate that represents the dynamic method. This
// action completes the method. Any further attempts to
// change the method are ignored.
HelloDelegate hi =
(HelloDelegate) hello.CreateDelegate(typeof(HelloDelegate));
// Use the delegate to execute the dynamic method.
Console.WriteLine("\r\nUse the delegate to execute the dynamic method:");
int retval = hi("\r\nHello, World!", 42);
Console.WriteLine("Invoking delegate hi(\"Hello, World!\", 42) returned: " + retval);
// Execute it again, with different arguments.
retval = hi("\r\nHi, Mom!", 5280);
Console.WriteLine("Invoking delegate hi(\"Hi, Mom!\", 5280) returned: " + retval);
Console.WriteLine("\r\nUse the Invoke method to execute the dynamic method:");
// Create an array of arguments to use with the Invoke method.
object[] invokeArgs = {"\r\nHello, World!", 42};
// Invoke the dynamic method using the arguments. This is much
// slower than using the delegate, because you must create an
// array to contain the arguments, and value-type arguments
// must be boxed.
object objRet = hello.Invoke(null, BindingFlags.ExactBinding, null, invokeArgs, new CultureInfo("en-us"));
Console.WriteLine("hello.Invoke returned: " + objRet);
Console.WriteLine("\r\n ----- Display information about the dynamic method -----");
// Display MethodAttributes for the dynamic method, set when
// the dynamic method was created.
Console.WriteLine("\r\nMethod Attributes: {0}", hello.Attributes);
// Display the calling convention of the dynamic method, set when the
// dynamic method was created.
Console.WriteLine("\r\nCalling convention: {0}", hello.CallingConvention);
// Display the declaring type, which is always null for dynamic
// methods.
if (hello.DeclaringType == null)
{
Console.WriteLine("\r\nDeclaringType is always null for dynamic methods.");
}
else
{
Console.WriteLine("DeclaringType: {0}", hello.DeclaringType);
}
// Display the default value for InitLocals.
if (hello.InitLocals)
{
Console.Write("\r\nThis method contains verifiable code.");
}
else
{
Console.Write("\r\nThis method contains unverifiable code.");
}
Console.WriteLine(" (InitLocals = {0})", hello.InitLocals);
// Display the module specified when the dynamic method was created.
Console.WriteLine("\r\nModule: {0}", hello.Module);
// Display the name specified when the dynamic method was created.
// Note that the name can be blank.
Console.WriteLine("\r\nName: {0}", hello.Name);
// For dynamic methods, the reflected type is always null.
if (hello.ReflectedType == null)
{
Console.WriteLine("\r\nReflectedType is null.");
}
else
{
Console.WriteLine("\r\nReflectedType: {0}", hello.ReflectedType);
}
if (hello.ReturnParameter == null)
{
Console.WriteLine("\r\nMethod has no return parameter.");
}
else
{
Console.WriteLine("\r\nReturn parameter: {0}", hello.ReturnParameter);
}
// If the method has no return type, ReturnType is System.Void.
Console.WriteLine("\r\nReturn type: {0}", hello.ReturnType);
// ReturnTypeCustomAttributes returns an ICustomeAttributeProvider
// that can be used to enumerate the custom attributes of the
// return value. At present, there is no way to set such custom
// attributes, so the list is empty.
if (hello.ReturnType == typeof(void))
{
Console.WriteLine("The method has no return type.");
}
else
{
ICustomAttributeProvider caProvider = hello.ReturnTypeCustomAttributes;
object[] returnAttributes = caProvider.GetCustomAttributes(true);
if (returnAttributes.Length == 0)
{
Console.WriteLine("\r\nThe return type has no custom attributes.");
}
else
{
Console.WriteLine("\r\nThe return type has the following custom attributes:");
foreach( object attr in returnAttributes )
{
Console.WriteLine("\t{0}", attr.ToString());
}
}
}
Console.WriteLine("\r\nToString: {0}", hello.ToString());
// Display parameter information.
ParameterInfo[] parameters = hello.GetParameters();
Console.WriteLine("\r\nParameters: name, type, ParameterAttributes");
foreach( ParameterInfo p in parameters )
{
Console.WriteLine("\t{0}, {1}, {2}",
p.Name, p.ParameterType, p.Attributes);
}
}
}
开发者ID:.NET开发者,项目名称:System.Reflection.Emit,代码行数:179,代码来源:DynamicMethod 输出:
Use the delegate to execute the dynamic method:
Hello, World!
Invoking delegate hi("Hello, World!", 42) returned: 42
Hi, Mom!
Invoking delegate hi("Hi, Mom!", 5280) returned: 5280
Use the Invoke method to execute the dynamic method:
Hello, World!
hello.Invoke returned: 42
----- Display information about the dynamic method -----
Method Attributes: PrivateScope, Public, Static
Calling convention: Standard
DeclaringType is always null for dynamic methods.
This method contains verifiable code. (InitLocals = True)
Module: CommonLanguageRuntimeLibrary
Name: Hello
ReflectedType is null.
Method has no return parameter.
Return type: System.Int32
The return type has no custom attributes.
ToString: Int32 Hello(System.String, Int32)
Parameters: name, type, ParameterAttributes
message, System.String, In
valueToReturn, System.Int32, In
注:本文中的System.Reflection.Emit.DynamicMethod类示例整理自Github/MSDocs等源码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。 |
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