如何使用子串功能 [英] how to use the substring function

问题描述

变量包含字符串值.我需要使用该字符串的最后两个字符.我可以为此目的使用substring函数吗?如果可以，可以给我一个简单的例子.
还是有另一种方法?

A variable contains a string value. i need to take the last two characters of that string. can i use the substring function for this purpose?if so can any one give me a simple example for that.
or is there another way of doing this?

推荐答案

是的，您可以使用substring函数.请参见此处 [

Yes you can use the substring function. See here[^] for an example.

为回答您的问题，我做了以下工作:我只计算了两个最常用的标准.NET库的所有公共类型的公共成员总数:"mscorelib"和"System.Core"，两者都覆盖了名称空间System.我不算类型，只算类型成员，例如System.String.Substring.

结果如下:

< il> mscorelib:39882个公共成员
< il> System.Core:6811个公共成员
< il>总计:46693个公共成员

To reply to your question, I''ve done the following: I counted total number of public members of all public types of just two most used standard .NET libraries: "mscorelib" and "System.Core", both covering the name space System. I did not count the types, only the type members, such as System.String.Substring.

Here are the results:

<il>mscorelib: 39882 public members
<il>System.Core: 6811 public members
<il>Total: 46693 public members

using System;
using System.Reflection;

//...

static int CountPublicMembers(Assembly assembly) {
    int result = 0;
    Type[] types = assembly.GetTypes();
    foreach (Type type in types)
        result += type.GetMembers().Length;
    return result;
} //CountPublicMembers

static void CountAll() {
    Assembly mscorelib = typeof(System.String).Assembly;
    Assembly systemCore = typeof(System.Action).Assembly;
    int iMscorelib = CountPublicMembers(mscorelib);
    int iSystemCore = CountPublicMembers(systemCore);
    System.Console.WriteLine(
        "{0}+{1} = {2}",
        iMscorelib, iSystemCore,
        iMscorelib + iSystemCore);
} //CountAll

—SA

—SA

尝试

string str = "YourStringValues";
  str = str.Substring(str.Length - 2); // Passing parameter Zero based starting character position of substring.
Console.WriteLine(str);  // Print Last two Character eg:- es

输出:-es

output :- es

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