Why is my DataTable-to-CSV conversion placing all data in a single cell, and how can I fix it?

Solve the problem of merging data into a single cell in DataTable to CSV conversion

When exporting a DataTable to a CSV file, users may encounter an issue where the data is not properly separated, causing all values ​​to appear in the first cell of each row. To resolve this issue, let's examine the code and identify the underlying cause.

The code first creates a StringBuilder object, iterates through the columns of the DataTable, and generates a header row with comma-separated column names. Next, it iterates through the rows of the DataTable and retrieves the value of each column, appending it to the StringBuilder. However, the problem arises in the way the data is separated.

The problem lies in adding the data to the StringBuilder's loop block. The following lines of code are used to separate values:

<code>sb.Append(row[i].ToString() + ",");</code>

This line of code adds a comma to the StringBuilder after each data value. However, if the commas at the end of each row are not removed, Excel may interpret the data as individual cells rather than individual values.

To fix this, remove the trailing comma from the last iteration of the inner loop:

<code>for (int i = 0; i < dt.Columns.Count; i++)
{
    sb.Append(row[i].ToString());

    // 移除最后一次迭代的尾随逗号
    if (i == dt.Columns.Count - 1)
        sb.Remove(sb.Length - 1, 1);
    else
        sb.Append(",");
}</code>

Modifying the code in this way will remove the trailing comma from the last value in each row, allowing Excel to properly separate the data into individual cells.

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