将数据网格视图导出到 csv 文件

问题描述

我正在开发一个应用程序，它将我的 DataGridView 称为scannerDataGridView 导出到一个 csv 文件.

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

找到了一些示例代码来执行此操作，但无法使其正常工作.顺便说一句，我的数据网格不是数据绑定到源.

Found some example code to do this, but can't get it working. Btw my datagrid isn't databound to a source.

当我尝试使用 Streamwriter 仅写入列标题时一切顺利，但是当我尝试导出包括数据在内的整个数据网格时，我得到了一个例外.

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.

System.NullReferenceException:未将对象引用设置为实例的一个对象.在 Scanmonitor.Form1.button1_Click(对象发送者，事件参数 e)

这是我的代码，以下行给出了错误:

Here is my Code, error is given on the following line:

dataFromGrid = dataFromGrid + ',' + dataRowObject.Cells[i].Value.ToString();

//csvFileWriter = StreamWriter
//scannerDataGridView = DataGridView

private void button1_Click(object sender, EventArgs e)
{
    string CsvFpath = @"C:scannerCSV-EXPORT.csv";
    try
    {
        System.IO.StreamWriter csvFileWriter = new StreamWriter(CsvFpath, false);

        string columnHeaderText = "";

        int countColumn = scannerDataGridView.ColumnCount - 1;

        if (countColumn >= 0)
        {
            columnHeaderText = scannerDataGridView.Columns[0].HeaderText;
        }

        for (int i = 1; i <= 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 <= countColumn; i++)
                {
                    dataFromGrid = dataFromGrid + ',' + dataRowObject.Cells[i].Value.ToString();

                    csvFileWriter.WriteLine(dataFromGrid);
                }
            }
        }


        csvFileWriter.Flush();
        csvFileWriter.Close();
    }
    catch (Exception exceptionObject)
    {
        MessageBox.Show(exceptionObject.ToString());
    }

推荐答案

发现问题，编码没问题，但我有一个空单元格导致了问题.

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

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