C＃ - 错误＆QUOT;不是所有code路径返回一个值＆QUOT;与数组作为out参数 [英] C# - Error "not all code paths return a value" with an array as out parameter

问题描述

目前，我有以下code：

  

公众诠释GetSeatInfoString（DisplayOptions选择，出来的String [] strSeatInfoStrings）

  {
        strSeatInfoStrings = NULL;
        诠释计数= GetNumOfSeats（选择）;        如果（（计数＆LT; = 0））
            返回0;        strSeatInfoStrings =新的字符串[统计]        INT I = 0;        对于（INT指数= 0;＆指数LT = m_totNumOfSeats  -  1;指数++）
        {
            如果（string.IsNullOrEmpty（m_nameList [指数]））
                strSeatInfoStrings [I +] =
 

  
  

m_nameList [指数]的ToString（）;
              }

 }
 

这code产生的，...... GetSeatInfoString.DisplayOptions错误，出来的String []）'：不是所有的code路径返回一个值基本上，我期待在上面做。方法是循环的阵列以及包含一个字符串数组中的任何值，我想这些然后加入到新的数组，strSeatInfoStrings进而，可以从一个单独的类，然后在显示新的数组的内容被称为列表框。

如何纠正这种任何建议？

在此先感谢

解决方案

您可以添加回 strSeatInfoStrings.Length 末

 公众诠释GetSeatInfoString（DisplayOptions选择，出来的String [] strSeatInfoStrings）    {
        strSeatInfoStrings = NULL;
        诠释计数= GetNumOfSeats（选择）;        如果（（计数＆LT; = 0））
            返回0;        strSeatInfoStrings =新的字符串[统计]        INT I = 0;        对于（INT指数= 0;＆指数LT = m_totNumOfSeats  -  1;指数++）
        {
            如果（string.IsNullOrEmpty（m_nameList [指数]））
                strSeatInfoStrings [I +] =
m_nameList [指数]的ToString（）; }    返回strSeatInfoStrings.Length;    }
 

I currently have the below code:

public int GetSeatInfoString(DisplayOptions choice, out string[] strSeatInfoStrings)

    {
        strSeatInfoStrings = null;
        int count = GetNumOfSeats(choice);

        if ((count <= 0))
            return 0;

        strSeatInfoStrings = new string[count];

        int i = 0;

        for (int index = 0; index <= m_totNumOfSeats - 1; index++)
        {
            if (string.IsNullOrEmpty(m_nameList[index]))
                strSeatInfoStrings[i++] =

m_nameList[index].ToString(); }

    }

This code produces an error of, "...GetSeatInfoString.DisplayOptions, out string[])': not all code paths return a value. Basically, what I am looking to do in the above method is to cycle through an array and for any values in the array that contain a string, I want these then adding to the new array, strSeatInfoStrings which in turn, can be called from a separate class and the new array content then displayed in a listbox.

Any suggestions on how to rectify this?

Thanks in advance

解决方案

You can add return strSeatInfoStrings.Length at the end

public int GetSeatInfoString(DisplayOptions choice, out string[] strSeatInfoStrings)

    {
        strSeatInfoStrings = null;
        int count = GetNumOfSeats(choice);

        if ((count <= 0))
            return 0;

        strSeatInfoStrings = new string[count];

        int i = 0;

        for (int index = 0; index <= m_totNumOfSeats - 1; index++)
        {
            if (string.IsNullOrEmpty(m_nameList[index]))
                strSeatInfoStrings[i++] =
m_nameList[index].ToString(); }

    return strSeatInfoStrings.Length;

    }

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