Exporting datagridview to csv file

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I\'m working on a application which will export my DataGridView called scannerDataGridView to a csv file.

Found some example code to do this, but can\'t get it worki

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8条回答

后悔当初

2020-11-29 10:41

LINQ FTW!

var sb = new StringBuilder();

var headers = dataGridView1.Columns.Cast<DataGridViewColumn>();
sb.AppendLine(string.Join(",", headers.Select(column => "\"" + column.HeaderText + "\"").ToArray()));

foreach (DataGridViewRow row in dataGridView1.Rows)
{
    var cells = row.Cells.Cast<DataGridViewCell>();
    sb.AppendLine(string.Join(",", cells.Select(cell => "\"" + cell.Value + "\"").ToArray()));
}

And indeed, c.Value.ToString() will throw on null value, while c.Value will correctly convert to an empty string.

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北恋

2020-11-29 10:42
A little known feature of the DataGridView is the ability to programmatically select some or all of the DataGridCells, and send them to a DataObject using the method DataGridView.GetClipboardContent(). Whats the advantage of this then?

A DataObject doesn't just store an object, but rather the representation of that object in various different formats. This is how the Clipboard is able to work its magic; it has various formats stored and different controls/classes can specify which format they wish to accept. In this case, the DataGridView will store the selected cells in the DataObject as a tab-delimited text format, a CSV format, or as HTML (*).

The contents of the DataObject can be retrieved by calling the DataObject.GetData() or DataObject.GetText() methods and specifying a predefined data format enum. In this case, we want the format to be TextDataFormat.CommaSeparatedValue for CSV, then we can just write that result to a file using System.IO.File class.

(*) Actually, what it returns is not, strictly speaking, HTML. This format will also contain a data header that you were not expecting. While the header does contain the starting position of the HTML, I just discard anything above the HTML tag like myString.Substring(IndexOf("<HTML>"));.

Observe the following code:
```
void SaveDataGridViewToCSV(string filename)
{        
    // Choose whether to write header. Use EnableWithoutHeaderText instead to omit header.
    dataGridView1.ClipboardCopyMode = DataGridViewClipboardCopyMode.EnableAlwaysIncludeHeaderText;
    // Select all the cells
    dataGridView1.SelectAll();
    // Copy selected cells to DataObject
    DataObject dataObject = dataGridView1.GetClipboardContent();
    // Get the text of the DataObject, and serialize it to a file
    File.WriteAllText(filename, dataObject.GetText(TextDataFormat.CommaSeparatedValue));
}
```
Now, isn't that better? Why re-invent the wheel?

Hope this helps...
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悲&欢浪女

2020-11-29 10:50

Found the problem, the coding was fine but i had an empty cell that gave the problem.

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一向

2020-11-29 10:50
I think this is the correct for your SaveToCSV function : ( otherwise Null ...)
```
 for (int i = 0; i < columnCount; i++)
```
Not :
```
 for (int i = 1; (i - 1) < DGV.RowCount; i++)
```
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醉话见心

2020-11-29 10:51
The line "csvFileWriter.WriteLine(dataFromGrid);" should be moved down one line below the closing bracket, else you'll get a lot of repeating results:
```
for (int i = 1; i <= countColumn; i++)
{
dataFromGrid = dataFromGrid + ',' + dataRowObject.Cells[i].Value.ToString();
}
csvFileWriter.WriteLine(dataFromGrid);
```
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北恋

2020-11-29 10:53

Your code was almost there... But I made the following corrections and it works great. Thanks for the post.

Error:

string[] output = new string[dgvLista_Apl_Geral.RowCount + 1];

Correction:

string[] output = new string[DGV.RowCount + 1];

Error:

System.IO.File.WriteAllLines(filename, output, System.Text.Encoding.UTF8);

Correction:

System.IO.File.WriteAllLines(sfd.FileName, output, System.Text.Encoding.UTF8);

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