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POExporting datagridview to csv file
 

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  1. POExporting datagridview to csv file
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    <p>I'm working on a application which will export my DataGridView called scannerDataGridView to a csv file.</p> <p>Found some example code to do this, but can't get it working. Btw my datagrid isn't databound to a source.</p> <p>When i try to use the Streamwriter to only write the column headers everything goes well, but when i try to export the whole datagrid including data i get an exeption trhown.</p> <blockquote> <p>System.NullReferenceException: Object reference not set to an instance of an object. at Scanmonitor.Form1.button1_Click(Object sender, EventArgs e)</p> </blockquote> <p>Here is my Code, error is given on the following line:</p> <blockquote> <p>dataFromGrid = dataFromGrid + ',' + dataRowObject.Cells[i].Value.ToString();</p> </blockquote> <pre><code>//csvFileWriter = StreamWriter //scannerDataGridView = DataGridView private void button1_Click(object sender, EventArgs e) { string CsvFpath = @"C:\scanner\CSV-EXPORT.csv"; try { System.IO.StreamWriter csvFileWriter = new StreamWriter(CsvFpath, false); string columnHeaderText = ""; int countColumn = scannerDataGridView.ColumnCount - 1; if (countColumn &gt;= 0) { columnHeaderText = scannerDataGridView.Columns[0].HeaderText; } for (int i = 1; i &lt;= countColumn; i++) { columnHeaderText = columnHeaderText + ',' + scannerDataGridView.Columns[i].HeaderText; } csvFileWriter.WriteLine(columnHeaderText); foreach (DataGridViewRow dataRowObject in scannerDataGridView.Rows) { if (!dataRowObject.IsNewRow) { string dataFromGrid = ""; dataFromGrid = dataRowObject.Cells[0].Value.ToString(); for (int i = 1; i &lt;= countColumn; i++) { dataFromGrid = dataFromGrid + ',' + dataRowObject.Cells[i].Value.ToString(); csvFileWriter.WriteLine(dataFromGrid); } } } csvFileWriter.Flush(); csvFileWriter.Close(); } catch (Exception exceptionObject) { MessageBox.Show(exceptionObject.ToString()); } </code></pre>
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    1. USPandaNL
    1. USPandaNL
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      1. VTUpMod
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      1. USSaurabh Gandhi
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      1. VTUpMod
    1. COAt what line is the exception thrown? Also you can use a foreach to go through the columns of each row as well: foreach (DataGridViewCell cell in dataRowObject.Cells), unless there is a specific reason you'd prefer the normal for loop?
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      1. USDan
    2. COAlso maybe check that scannerDataGridView.Rows.Count > 0
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      1. USDan
    3. COHi PandaNL, I have deleted my answer. I still believe that offsending line should read `object value = dataRowObject.Cells[i].Value; dataFromGrid = dataFromGrid + ',' + (value ?? string.Empty).ToString()); `
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      1. USNikola Markovinović
 

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