比较字符串数组 [英] Comparing string arrays

问题描述

您好，我有一个代码来比较两个字符串数组s1和s2，如下所示:

internal string[] Compare(string[] s1, string[] s2)
        {
            string[] r = new string[1], rh = new string[1];
            Int32 a = 1;
                foreach (string s in s1)
                {
                    bool b = false;
                    foreach (string sr in s2)
                    {
                        if (s == sr) { b = true; }
                    }

                    if (b == true)
                    {
                        if (a.Equals(1) == true)
                        {
                            r = new string[a];
                            r[a - 1] = s;
                            rh = r;
                            a = a + 1;
                        }
                        else
                        {
                            r = new string[a];
                            Int32 bl = 0;
                            while (bl <= rh.Length - 1)
                            {
                                r[bl] = rh[bl];
                                bl = bl + 1;
                            }
                            r[a - 1] = s;
                            a = a + 1;
                        }
                    }
                    b = false;
                }
                return r;
        }

我称它为string[] a = Compare(s1,s2)和a为空(s1和s2不为空)
为什么返回的结果为null?

解决方案

您似乎没有return语句.甚至不应该编译.

结果不为null.如果两个输入数组中的所有字符串都不匹配，则 a 中的第一个值将为null.例如，这将生成一个大小为1的数组，其中第一个元素不为null:

 字符串 [] s = Compare(新 "   a"，  b"}， string  [] {  a"，  d"}); 

另外，您的某些代码很奇怪.例如，您应该只对整数使用相等运算符，而不要使用等于"方法.

那么，您在这里有什么问题?

Hello, I have a code to compare two string arrays s1 and s2 like this:

internal string[] Compare(string[] s1, string[] s2)
        {
            string[] r = new string[1], rh = new string[1];
            Int32 a = 1;
                foreach (string s in s1)
                {
                    bool b = false;
                    foreach (string sr in s2)
                    {
                        if (s == sr) { b = true; }
                    }

                    if (b == true)
                    {
                        if (a.Equals(1) == true)
                        {
                            r = new string[a];
                            r[a - 1] = s;
                            rh = r;
                            a = a + 1;
                        }
                        else
                        {
                            r = new string[a];
                            Int32 bl = 0;
                            while (bl <= rh.Length - 1)
                            {
                                r[bl] = rh[bl];
                                bl = bl + 1;
                            }
                            r[a - 1] = s;
                            a = a + 1;
                        }
                    }
                    b = false;
                }
                return r;
        }

I call it like string[] a = Compare(s1,s2) and a is null (s1 and s2 are not null)
Why the returned result is null?

解决方案

You don''t appear to have a return statement. This should not even compile.

The result isn''t null. The first value in a will be null if none of the strings in the two input arrays match. For example, this produces an array of size 1 where the first element is not null:

string[] s = Compare(new string[] { "a", "b" }, new string[] { "a", "d" });

Also, some of your code is strange. For example, you should just use the equality operator rather than the "Equals" method on an integer.

So, what is your question here?

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