为什么总是在结尾处将空字符串[非空白]添加到字符串变量中?

问题描述

ex，
字符串str ="Hai";
逐行执行并检查str持有什么(选择整个内容(cntl + A)，然后在字母i后面查看)

ex,
string str = "Hai";
Do line by line execution and check what str holds(Select the whole thing (cntl + A) and See after the letter i)

推荐答案

string str = "aaa";
//Test 1
if (str.Contains(String.Empty))
    MessageBox.Show("String aaa contains an empty string");
//Test 2
int pos = str.IndexOf(String.Empty);
int pos2 = str.IndexOf("a");

//Feedback
MessageBox.Show("String.Empty at Position: " + pos.ToString());
MessageBox.Show("First 'a' is at Position: " + pos.ToString());
MessageBox.Show("The 2 position index match: " + (pos == pos2));

string str = "aaa";
str += "*";
string[] Ss = str.Split(new char[]{'*'}, StringSplitOptions.RemoveEmptyEntries);
int a = Ss.Length;
Response.Write(a);
if(Ss[1] == string.Empty) Response.Write("Empty string is there....");  

当然，由于Ss只有1个元素长，因此最后一行现在将引发异常.

Of course, the last line will now throw an exception as Ss is only 1 element long.

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