将标题添加到我的 csv 文件中答案

【问题标题】：prepend headers to my csv file将标题添加到我的 csv 文件中
【发布时间】：2017-04-05 04:38:15
【问题描述】：

我想将标题添加到我的 CSV 文件中，以便让数据反映标题。我将如何解决这个问题而不必每次写入文件时都添加它？这意味着我只希望在每次导出时添加一次标题。当我导出到相同的文件名时，它不应该创建相同标题的重复项。下面是我写入文件的代码：

 private void button6_Click_2(object sender, EventArgs e)
    {

        int count_row = dataGridView1.RowCount;
        int count_cell = dataGridView1.Rows[0].Cells.Count;

        MessageBox.Show("Please wait while " +comboBox5.Text+ " table is being exported..");
        for (int row_index = 0; row_index <= count_row - 2; row_index++)
        {

            for (int cell_index = 1; cell_index <= count_cell - 1; cell_index++)
            {
                textBox8.Text = textBox8.Text + dataGridView1.Rows[row_index].Cells[cell_index].Value.ToString() + ",";

            }
            textBox8.Text = textBox8.Text + "\r\n";
        }
        System.IO.File.WriteAllText("C:\\Users\\jdavis\\Desktop\\"+comboBox5.Text+".csv", textBox8.Text);
        MessageBox.Show("Export  of " +comboBox5.Text+ " table is complete!");
        textBox8.Clear();
    }

更新尝试：

  private void button6_Click_2(object sender, EventArgs e)
    {

        int count_row = dataGridView1.RowCount;
        int count_cell = dataGridView1.Rows[0].Cells.Count;

        MessageBox.Show("Please wait while " + comboBox5.Text + " table is being exported..");

       if (!File.Exists(comboBox5.Text))
        {

            string rxHeader = "Code" + "," + "Description" + "," + "NDC" + "," + "Supplier Code"
               + "," + "Supplier Description" + "," + "Pack Size" + "," + "UOM" + Environment.NewLine;


            for (int row_index = 0; row_index <= count_row - 2; row_index++)
            {

                for (int cell_index = 1; cell_index <= count_cell - 1; cell_index++)
                {
                    textBox8.Text = textBox8.Text + dataGridView1.Rows[row_index].Cells[cell_index].Value.ToString() + ",";

                }
                textBox8.Text = textBox8.Text + "\r\n";
            }
            System.IO.File.WriteAllText("C:\\Users\\jdavis\\Desktop\\" + comboBox5.Text + ".csv", textBox8.Text);
            MessageBox.Show("Export  of " + comboBox5.Text + " table is complete!");
            textBox8.Clear();
        }

    }

我真的很想尝试在没有 SteamWriter 的情况下实现它，我哪里错了？

private void button6_Click_2(object sender, EventArgs e)
    {

        int count_row = dataGridView1.RowCount;
        int count_cell = dataGridView1.Rows[0].Cells.Count;
        string path = "C:\\Users\\jdavis\\Desktop\\" + comboBox5.Text + ".csv";
        string rxHeader = "Code" + "," + "Description" + "," + "NDC" + "," + "Supplier Code"
        + "," + "Supplier Description" + "," + "Pack Size" + "," + "UOM";


        MessageBox.Show("Please wait while " + comboBox5.Text + " table is being exported..");

        for (int row_index = 0; row_index <= count_row - 2; row_index++)
        {

            for (int cell_index = 1; cell_index <= count_cell - 1; cell_index++)
            {
                textBox8.Text = textBox8.Text + dataGridView1.Rows[row_index].Cells[cell_index].Value.ToString() + ",";

            }
            textBox8.Text = textBox8.Text + "\r\n";

            if (!File.Exists(path))
            {
                System.IO.File.WriteAllText(path, rxHeader);
                System.IO.File.WriteAllText(path, textBox8.Text);
            }
            else
            {    
                System.IO.File.AppendAllText(path, textBox8.Text);
                MessageBox.Show("Export  of " + comboBox5.Text + " table is complete!");
                textBox8.Clear();
            }
        }
    }

【问题讨论】：

关于 WriteAllText 的 MSDN ：如果目标文件已经存在，则将其覆盖。 所以上面的代码总是重写所有标题或其他内容。
其实没有。我导出到文件并将其附加到现有数据中，因此您实际上对此有误。隐藏的文本框是 @Steve 的解决方法
@RezaAghaei 如果我按照我在原始问题的更新尝试中的建议检查它是否存在，该怎么办
史蒂夫没有错，他实际上是直接从文档中复制/粘贴的。 WriteAllText 覆盖文件。当然，您正在通过使用一串文本框来保留附加文本来解决这个问题，但最后，当您调用该方法时，您正在替换整个文件，而不是附加到它。
显然你并没有意识到这一点，否则你不会写这个“实际上不，它没有”来回应史蒂夫的评论。在解决这个问题方面，我可能会提供一些东西，但必须指出这一点，因为当那个人实际上完全正确时，你公然告诉某人是错的。

标签： c# winforms csv

【解决方案1】：

for (int row_index = 0; row_index <= count_row - 2; row_index++)
{
    textBox8.Text = textBox8.Text + "\r\n";

    for (int cell_index = 1; cell_index <= count_cell - 1; cell_index++)
    {
        textBox8.Text = textBox8.Text + dataGridView1.Rows[row_index].Cells[cell_index].Value.ToString() + ",";

    }
}

进入textBox8的属性面板即可。文本并用逗号添加列标题，并将 textbox8 可见性设置为隐藏。

【讨论】：

【解决方案2】：

只需用这个 sn-p 编辑我的代码即可得到答案：

 if (!File.Exists(path))
    {
        System.IO.File.WriteAllText(path, rxHeader + textBox8.Text);
    }
    else
    {    
        System.IO.File.AppendAllText(path, textBox8.Text);
        MessageBox.Show("Export  of " + comboBox5.Text + " table is complete!");
        textBox8.Clear();
    }

【讨论】：

【解决方案3】：

这是一个简短的版本，它甚至可以正确处理包含 , 和 " 的值：

dataGridView1.ClipboardCopyMode = DataGridViewClipboardCopyMode.EnableAlwaysIncludeHeaderText;
dataGridView1.RowHeadersVisible = false;  // the row headers column is copied too if visible
dataGridView1.SelectAll();                // only the selected cells are used (the Windows Clipboard is not used)

DataObject dataObject = dataGridView1.GetClipboardContent();      // 4 Data Formats: Text,Csv,HTML Format,UnicodeText
File.WriteAllText("1.csv", dataObject.GetData("Csv") as string);  // DataFormats.CommaSeparatedValue = "Csv"

//string html = Encoding.ASCII.GetString((dataObject.GetData("HTML Format") as MemoryStream).ToArray()); // just the HTML Clipboard Format is in a MemoryStream

【讨论】：

【解决方案4】：

这是我建议的解决方案。我的建议是先检查文件是否存在，然后再决定是否需要写header。

private void DoTheWork(int fileIDtoUpdate)
    {
        //this is just my representation of what probably already exist in your project
        string textInTheTextBox = "blah blah blah blah\nI love text\nI love code\nI love to Code\ndon't you just love to code!";
        string filePath1 = @"M:\StackOverflowQuestionsAndAnswers\40726017\File1.txt";
        string filePath2 = @"M:\StackOverflowQuestionsAndAnswers\40726017\File2.txt";
        string filePath3 = @"M:\StackOverflowQuestionsAndAnswers\40726017\File3.txt";
        string filePath4 = @"M:\StackOverflowQuestionsAndAnswers\40726017\File4.txt";
        string fileToWorkWith = string.Empty;
        //decide which file to work with
        switch (fileIDtoUpdate)
        {
            case 1:
                fileToWorkWith = filePath1;
                break;
            case 2:
                fileToWorkWith = filePath2;
                break;
            case 3:
                fileToWorkWith = filePath3;
                break;
            case 4:
                fileToWorkWith = filePath4;
                break;
            default:
                break;
        }
        //check if the file existed
        bool fileExisted = File.Exists(fileToWorkWith);
        using (StreamWriter sw = new StreamWriter(fileToWorkWith, true))
        {
            if (!fileExisted)
            {
                //if the file did not exist, then you need to put your header line!
                sw.WriteLine("Write your Header Line here");
            }
            sw.WriteLine(textInTheTextBox);//down here... who cares if the file existed or not, you need to append this text to it no matter what!
        }
    }

【讨论】：

我真的很想在没有 SteamWriter 的情况下这样做，你能看看我更新的代码，看看哪里出错了吗？