C＃ - 列表<string>'不包含定义‘物品’

Question

完全错误：

System.Collections.Generic.List<string>' does not contain a definition for 'Items' and no extension method 'Items' accepting a first argument of type 'System.Collections.Generic.List<string>' could be found (are you missing a using directive or an assembly reference?)

我的任务是用savefiledialog窗口保存为文本文件，这是我使用的代码：

public void Create() 
     { 
      SaveFileDialog save = new SaveFileDialog(); 

      save.FileName = "Report.txt"; 

      save.Filter = "Text File | *.txt"; 

      if (save.ShowDialog() == DialogResult.OK) 
      { 

       StreamWriter writer = new StreamWriter(save.OpenFile()); 

       for (int i = 0; i < _Reports.Items.Count; i++) 
       { 

        writer.WriteLine(_Reports.Items[i].ToString()); 

       } 

       writer.Dispose(); 
       writer.Close(); 

      } 
     } 

我也初始化使用

List<string> _Reports = new List<string>(); 

的清单，但清单的项目方法是不t支持。有没有办法来解决这个问题？

Answer 1

没有“Items”属性。你可以阅读有关List类here

这将只是_Reports.Count

Answer 2

你的错误说明了一切。没有什么所谓的项目与List<string>所以，你的代码应该是

public void Create() 
{ 
    SaveFileDialog save = new SaveFileDialog(); 
    save.FileName = "Report.txt"; 
    save.Filter = "Text File | *.txt"; 
    if (save.ShowDialog() == DialogResult.OK) 
    { 
     StreamWriter writer = new StreamWriter(save.OpenFile()); 
     for (int i = 0; i < _Reports.Count; i++) 
     { 
      writer.WriteLine(_Reports[i].ToString()); 
     } 
     writer.Dispose(); 
     writer.Close(); 
    } 
}