C# 中的 Func 泛型类型
Func 泛型类型存储匿名方法,并且是参数化类型。
在下面的示例中,我们有 4 个 func 类型实例 −
第一个类型接收 int 并返回 string
Func<int, string> one = (p) => string.Format("{0}", p);
第二个类型接收 bool 和 long 并返回 string
Func<bool, long, string> two = (q, p) =>string.Format("{0} and {1}", q, p);
第三个类型接收 bool 和 int 并返回 string
Func<bool, int, string> three = (q, p) => string.Format("{0} and {1}", q, p);
第四个类型接收 decimal 并返回 string
Func<decimal, string> four = (p) =>string.Format("{0}", p);
让我们看看如何显示它们 −
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)); } } }
输出
25 False and 76756566 True and 50 1.2
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