以C＃Windows形式从DataGridView写入文本文件

Question

I want to write the data from my DataGridView to a textfile.

The following code writes the data but it is not formatted correctly.

StreamWriter sW = new StreamWriter(dirLocationString);

string lines = "";

for (int row = 0; row< numRows1; row++){
     for (int col = 0; col < 4; col++)
         {

          lines = lines + " " + dataGridView1.Rows[row].Cells[col].Value.ToString();

         }

      sW.WriteLine(lines);
}

   sW.Close();   

I want the output format to be like:

AAAA, BBBB, CCCC, DDDD 

But instead it displays the following:

AAAA BBBB CCCC DDDD
AAAA BBBB CCCC DDDD AAAA BBBB CCCC DDDD
AAAA BBBB CCCC DDDD AAAA BBBB CCCC DDDD AAAA BBBB CCCC DDDD
and so on..

Answer 1

Init lines in first loop :

StreamWriter sW = new StreamWriter(dirLocationString);

for (int row = 0; row< numRows1; row++){
    string lines = "";
    for (int col = 0; col < 4; col++)
    {
        lines += (string.IsNullOrEmpty(lines) ? " " : ", ") + dataGridView1.Rows[row].Cells[col].Value.ToString();
    }

    sW.WriteLine(lines);
}

sW.Close(); 

Answer 2

Unfortunately looping through rows and columns is prone to errors and not very succinct. Here is a little hack that takes advantage of Windows.Forms.Clipboard and DataGridView.GetClipboardContent() to do all the dirty work for you. DataGridView.GetClipboardContent() returns all the selected data cells as a DataObject, which is how the Clipboard class is able to store different types of data and formatting. The contents of the clipboard are then written to a file using the File class. You say you want a text file, but I see commas the example of your desired output, so I am assuming you would like a CSV file. You can also write out a text file by changing the Clipboard.GetText parameter.

void SaveDataGridViewToCSV(string Filename)
{
    // Choose whether to write header. Use EnableWithoutHeaderText instead to omit header.
    dataGridView1.ClipboardCopyMode = DataGridViewClipboardCopyMode.EnableWithAutoHeaderText;
    // Select all the cells
    dataGridView1.SelectAll();
    // Copy (set clipboard)
    Clipboard.SetDataObject(dataGridView1.GetClipboardContent());
    // Paste (get the clipboard and serialize it to a file)
    File.WriteAllText(Filename,Clipboard.GetText(TextDataFormat.CommaSeparatedValue));
}

Please note that an object must be serializable for it to be put on the Clipboard.

For a tab-delimited file, use the TextDataFormat.Text enum in your call to Clipboard.GetText() . You can also output your DataGridView as HTML by using TextDataFormat.Html instead of TextDataFormat.CommaSeparatedValue , but there is extra header data you have to parse out.

Hope this helps.