字符串写入器写入文本文件

Question

我有 100 个文本框，我试图将这些文本框中的所有文本写入文本文件，这是我的代码：

protected void Page_Load(object sender, EventArgs e)
{
    for (int i = 0; i <= 9; i++)
    {
        for (int j = 0; j <= 9; j++)
        {
            TextBox tb = new TextBox();
            tb.MaxLength = (1);
            tb.Width = Unit.Pixel(40);
            tb.Height = Unit.Pixel(40);
            // giving each textbox a different id  00-99
            tb.ID = i.ToString() + j.ToString();  
            Panel1.Controls.Add(tb);                       
        }
        Literal lc = new Literal();
        lc.Text = "<br />";
        Panel1.Controls.Add(lc);
    }
}

protected void btnShow_Click(object sender, EventArgs e)
{
    StringWriter stringWriter = new StringWriter();
    foreach (Control control in Panel1.Controls)
    {
        var textBox = control as TextBox;   
        if (textBox != null)
        {
            if (string.IsNullOrEmpty(textBox.Text))
            {                
                textBox.Style["visibility"] = "hidden";
            }
            // Write text to textfile.
            stringWriter.Write("test.txt", textBox.Text+","); 
        }  // end of if loop              
    }
}

我在 dev 文件夹中创建了一个名为 test.txt 的文件（我想它应该在它应该在的位置），它没有任何错误，但文本文件中没有任何文本。这是正确的方法吗？因为当我尝试 debug 时， stringWriter 的值将在第一个循环中以 test.txt 开头，在第二个循环中以 test.txttest.txt 开头。

Answer 1

最好使用 StreamWriter 类：

StreamWriter sw = new StreamWriter("test.txt");  // You should include System.IO;

var textBox = control as TextBox;   
if (textBox != null)
{
   if (string.IsNullOrEmpty(textBox.Text))
   {
     textBox.Style["visibility"] = "hidden";
   }
}
sw.Write(textBox.Text + ","); 

Answer 2

当您保持StringWriter打开时，数据不会保存到文件中。在btnShow_Click的末尾关闭它：

StringWriter.Close();

或者

using (StringWriter stringwriter=new StringWriter())
{

//here is your code....
}