本文整理汇总了C#中System.Reflection.ParameterInfo.IsOptional属性的典型用法代码示例。如果您正苦于以下问题：C# ParameterInfo.IsOptional属性的具体用法？C# ParameterInfo.IsOptional怎么用？C# ParameterInfo.IsOptional使用的例子？那么, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在类System.Reflection.ParameterInfo的用法示例。
在下文中一共展示了ParameterInfo.IsOptional属性的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，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: DefineMethod
//引入命名空间
using System;
using System.Reflection;
using System.Threading;
using System.Reflection.Emit;
public class ParameterInfo_IsIn_IsOut_IsOptional
{
public static void DefineMethod()
{
AssemblyName myAssemblyName = new AssemblyName();
myAssemblyName.Name = "MyAssembly";
// Get the assembly builder from the application domain associated with the current thread.
AssemblyBuilder myAssemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.RunAndSave);
// Create a dynamic module in the assembly.
ModuleBuilder myModuleBuilder = myAssemblyBuilder.DefineDynamicModule("MyModule", "MyAssembly.dll");
// Create a type in the module.
TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("MyType");
// Create a method called MyMethod.
MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod("MyMethod",MethodAttributes.Public | MethodAttributes.HideBySig |
MethodAttributes.Static, typeof(string), new Type[] {typeof(int), typeof(short), typeof(long)});
// Set the attributes for the parameters of the method.
// Set the attribute for the first parameter to IN.
ParameterBuilder myParameterBuilder = myMethodBuilder.DefineParameter(1, ParameterAttributes.In, "MyIntParameter");
// Set the attribute for the second parameter to OUT.
myParameterBuilder = myMethodBuilder.DefineParameter(2, ParameterAttributes.Out, "MyShortParameter");
// Set the attribute for the third parameter to OPTIONAL.
myParameterBuilder = myMethodBuilder.DefineParameter(3, ParameterAttributes.Optional | ParameterAttributes.HasDefault, "MyLongParameter");
// Get the Microsoft Intermediate Language generator for the method.
ILGenerator myILGenerator = myMethodBuilder.GetILGenerator();
// Use the utility method to generate the MSIL instructions that print a string to the console.
myILGenerator.EmitWriteLine("Hello World!");
// Generate the "ret" MSIL instruction.
myILGenerator.Emit(OpCodes.Ret);
// End the creation of the type.
myTypeBuilder.CreateType();
}
public static void Main()
{
// Create a dynamic assembly with a type named MyType.
DefineMethod();
// Get the assemblies currently loaded in the application domain.
Assembly[] myAssemblies = Thread.GetDomain().GetAssemblies();
Assembly myAssembly = null;
// Get the assembly named MyAssembly.
for(int i = 0; i < myAssemblies.Length; i++)
if(String.Compare(myAssemblies[i].GetName(false).Name, "MyAssembly") == 0)
myAssembly = myAssemblies[i];
if(myAssembly != null)
{
// Get a type named MyType.
Type myType = myAssembly.GetType("MyType");
// Get a method named MyMethod from the type.
MethodBase myMethodBase = myType.GetMethod("MyMethod");
// Get the parameters associated with the method.
ParameterInfo[] myParameters = myMethodBase.GetParameters();
Console.WriteLine("\nThe method {0} has the {1} parameters :",
myMethodBase, myParameters.Length);
// Print the IN, OUT and OPTIONAL attributes associated with each of the parameters.
for(int i = 0; i < myParameters.Length; i++)
{
if(myParameters[i].IsIn)
Console.WriteLine("\tThe {0} parameter has the In attribute",
i + 1);
if(myParameters[i].IsOptional)
Console.WriteLine("\tThe {0} parameter has the Optional attribute",
i + 1);
if(myParameters[i].IsOut)
Console.WriteLine("\tThe {0} parameter has the Out attribute",
i + 1);
}
}
else
{
Console.WriteLine("Could not find a assembly named 'MyAssembly' for the current application domain");
}
}
}