本文整理汇总了C#中System.Func<TResult>代理的典型用法代码示例。如果您正苦于以下问题：C# Func<TResult>代理的具体用法？C# Func<TResult>怎么用？C# Func<TResult>使用的例子？那么, 这里精选的代理代码示例或许可以为您提供帮助。
Func<TResult>代理属于System命名空间，在下文中一共展示了Func<TResult>代理的5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: Main
//引入命名空间
using System;
static class Func1
{
public static void Main()
{
// Note that each lambda expression has no parameters.
LazyValue<int> lazyOne = new LazyValue<int>(() => ExpensiveOne());
LazyValue<long> lazyTwo = new LazyValue<long>(() => ExpensiveTwo("apple"));
Console.WriteLine("LazyValue objects have been created.");
// Get the values of the LazyValue objects.
Console.WriteLine(lazyOne.Value);
Console.WriteLine(lazyTwo.Value);
}
static int ExpensiveOne()
{
Console.WriteLine("\nExpensiveOne() is executing.");
return 1;
}
static long ExpensiveTwo(string input)
{
Console.WriteLine("\nExpensiveTwo() is executing.");
return (long)input.Length;
}
}
class LazyValue<T> where T : struct
{
private Nullable<T> val;
private Func<T> getValue;
// Constructor.
public LazyValue(Func<T> func)
{
val = null;
getValue = func;
}
public T Value
{
get
{
if (val == null)
// Execute the delegate.
val = getValue();
return (T)val;
}
}
}输出：
LazyValue objects have been created.
ExpensiveOne() is executing.
1
ExpensiveTwo() is executing.
5
示例2: Main
//引入命名空间
using System;
using System.IO;
delegate bool WriteMethod();
public class TestDelegate
{
public static void Main()
{
OutputTarget output = new OutputTarget();
WriteMethod methodCall = output.SendToFile;
if (methodCall())
Console.WriteLine("Success!");
else
Console.WriteLine("File write operation failed.");
}
}
public class OutputTarget
{
public bool SendToFile()
{
try
{
string fn = Path.GetTempFileName();
StreamWriter sw = new StreamWriter(fn);
sw.WriteLine("Hello, World!");
sw.Close();
return true;
}
catch
{
return false;
}
}
}示例3: Main
//引入命名空间
using System;
using System.IO;
public class TestDelegate
{
public static void Main()
{
OutputTarget output = new OutputTarget();
Func<bool> methodCall = output.SendToFile;
if (methodCall())
Console.WriteLine("Success!");
else
Console.WriteLine("File write operation failed.");
}
}
public class OutputTarget
{
public bool SendToFile()
{
try
{
string fn = Path.GetTempFileName();
StreamWriter sw = new StreamWriter(fn);
sw.WriteLine("Hello, World!");
sw.Close();
return true;
}
catch
{
return false;
}
}
}示例4: Main
//引入命名空间
using System;
using System.IO;
public class Anonymous
{
public static void Main()
{
OutputTarget output = new OutputTarget();
Func<bool> methodCall = delegate() { return output.SendToFile(); };
if (methodCall())
Console.WriteLine("Success!");
else
Console.WriteLine("File write operation failed.");
}
}
public class OutputTarget
{
public bool SendToFile()
{
try
{
string fn = Path.GetTempFileName();
StreamWriter sw = new StreamWriter(fn);
sw.WriteLine("Hello, World!");
sw.Close();
return true;
}
catch
{
return false;
}
}
}示例5: Main
//引入命名空间
using System;
using System.IO;
public class Anonymous
{
public static void Main()
{
OutputTarget output = new OutputTarget();
Func<bool> methodCall = () => output.SendToFile();
if (methodCall())
Console.WriteLine("Success!");
else
Console.WriteLine("File write operation failed.");
}
}
public class OutputTarget
{
public bool SendToFile()
{
try
{
string fn = Path.GetTempFileName();
StreamWriter sw = new StreamWriter(fn);
sw.WriteLine("Hello, World!");
sw.Close();
return true;
}
catch
{
return false;
}
}
}