C# 中的 Func 泛型型別
Func 泛型型別儲存匿名方法,並且是引數化型別。
在下面的示例中,我們有 4 個 func 型別例項 −
第一個型別接收 int 並返回 string
Func<int, string> one = (p) => string.Format("{0}", p);第二個型別接收 bool 和 long 並返回 string
Func<bool, long, string> two = (q, p) =>string.Format("{0} and {1}", q, p);第三個型別接收 bool 和 int 並返回 string
Func<bool, int, string> three = (q, p) => string.Format("{0} and {1}", q, p);第四個型別接收 decimal 並返回 string
Func<decimal, string> four = (p) =>string.Format("{0}", p);讓我們看看如何顯示它們 −
示例
using System;
using System.IO;
namespace Demo {
class Program {
static void Main(string[] args) {
// four func type instance
// first type receives int and returns string
Func<int, string> one = (p) =>
string.Format("{0}", p);
// second type receives bool & long and returns string
Func<bool, long, string> two = (q, p) =>
string.Format("{0} and {1}", q, p);
// three type receives bool & int and returns string
Func<bool, int, string> three = (q, p) =>
string.Format("{0} and {1}", q, p);
// fourth type receives decimal and returns string
Func<decimal, string> four = (p) =>
string.Format("{0}", p);
Console.WriteLine(one.Invoke(25));
Console.WriteLine(two.Invoke(false, 76756566));
Console.WriteLine(three.Invoke(true, 50));
Console.WriteLine(four.Invoke(1.2m));
}
}
}輸出
25 False and 76756566 True and 50 1.2
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