'minValue'不能大于maxValue错误。 [英] 'minValue' cannot be greater than maxValue error.

问题描述

您好，



我正在尝试读取文本文件（Words.txt），然后从Words.txt文件中选择一个单词。



但是我现在收到的'minValue'不能大于maxValue错误。



任何人都可以帮助我做错了什么？



我的WordListHelper类：

公共类WordListHelper 
 { 
 
 private readonly List< string> _wordList = new List< string>（）; 
 
 private async void ProjectFile（）
 {
 var _Folder = Windows.ApplicationModel.Package.Current.InstalledLocation; 
 _Folder = await _Folder.GetFolderAsync（Hangman）; 
 
 //获取文件
 
 StorageFolder sf = KnownFolders.DocumentsLibrary; 
 StorageFile file = await sf.GetFileAsync（Words.txt）; 
 string _wordList = await FileIO.ReadTextAsync（file）; 
} 
 
公共字符串Getword（）
 {
随机r = new Random（）; 
 
 int i = r.Next（0，_wordList.Count  -  1）; 
 
返回_wordList.ElementAt（i）; 
} 
 
} 
} 

引发错误的代码行：

 int i = r.Next（0，_wordList.Count  -  1）; 
 

问候，



Glen。

解决方案

似乎_wordList是空的，所以_wordList.Count - 1 = -1



首先来自_wordList在您的类级别声明，您不应在ProjectFile（）方法中使用类型作为前缀：

  private   async   void  ProjectFile（）
 {
  var  _Folder = Windows.ApplicationModel.Package.Current.InstalledLocation; 
 _Folder =  await  _Folder.GetFolderAsync（ 刽子手）; 
 
  //  获取文件 
 
 StorageFolder sf = KnownFolders.DocumentsLibrary; 
 StorageFile file =  await  sf.GetFileAsync（  Words.txt）; 
  string  result =  await  FileIO.ReadTextAsync（file）; 
 _wordList.Add（result）; 
} 
 

然后你应该在尝试在你的GetWord中使用它之前检查_wordList的内容（ ）方法：

  public   string  Getword （）
 {
 Random r =  new  Random（）; 
  int  i = -1; 
  if （_ wordList.Count >   0 ）{
i = r.Next（ 0 ，_ wordList.Count  -   1  ）; 
} 
 返回（i >  -1）？ _wordList.ElementAt（i）： string  .Empty; 
} 
 

希望这有帮助。

看起来像< b> _wordList.Count 等于零。

您确定 _wordlist 充满了拨打 GetWord（）所需的所有数据吗？

Hello,

I am trying to read in a text file (Words.txt) and then select a word out from the "Words.txt" file.

However I am now receiving a 'minValue' cannot be greater than maxValue error.

Can anyone help me with what I may have done wrong?

My WordListHelper class:

public class WordListHelper
    {

        private readonly List<string> _wordList = new List<string>();        

        private async void ProjectFile()
        {            
                var _Folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
                _Folder = await _Folder.GetFolderAsync("Hangman");
 
                // acquire file
            
                StorageFolder sf = KnownFolders.DocumentsLibrary;
                StorageFile file = await sf.GetFileAsync("Words.txt");
                string _wordList = await FileIO.ReadTextAsync(file);            
        }

        public string Getword()
        {
            Random r = new Random();

            int i = r.Next(0, _wordList.Count - 1);

            return _wordList.ElementAt(i);
        }

    }
}

Line of code that is throwing the error:

int i = r.Next(0, _wordList.Count - 1);

Regards,

Glen.

解决方案

It seems _wordList is empty, so _wordList.Count - 1 = -1

First of all since _wordList is declared at your class level you should not prefix its use with type in the ProjectFile() method:

private async void ProjectFile()
{
        var _Folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
        _Folder = await _Folder.GetFolderAsync("Hangman");

        // acquire file

        StorageFolder sf = KnownFolders.DocumentsLibrary;
        StorageFile file = await sf.GetFileAsync("Words.txt");
        string result = await FileIO.ReadTextAsync(file);
        _wordList.Add(result);
}

Then you should check for the content of _wordList before trying to use it in your GetWord() method:

public string Getword()
{
    Random r = new Random();
    int i = -1;
    if (_wordList.Count > 0) {
       i = r.Next(0, _wordList.Count - 1);
    }
    return (i > -1) ? _wordList.ElementAt(i) : string.Empty;
}

Hope this helps.

Looks like _wordList.Count equals zero.
Are you sure that _wordlist is filled with all the data needed when you call GetWord()?

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