C#问题解决方案---指定行列位置修改CSV文件

public static void WriteToCsv(string filePath, int targetRow, int targetColumn, string newData)
{
    List<List<string>> table = new List<List<string>>();

    // Read all lines from the file.
    var lines = File.ReadAllLines(filePath);

    foreach (var line in lines)
    {
        // Split each line into columns based on comma delimiter.
        var columns = line.Split(',');
        table.Add(new List<string>(columns));
    }

    // Ensure the target row exists; add empty rows if necessary.
    while (table.Count <= targetRow)
    {
        table.Add(new List<string>());
    }

    // Ensure enough columns exist in the target row.
    while (targetColumn >= table[targetRow].Count)
    {
        table[targetRow].Add("");
    }

    // Modify the cell at the specified position with new data.
    table[targetRow][targetColumn] = newData;

    // Convert back to a single string per line and save changes.
    var updatedContent = "";
    foreach (var row in table)
    {
        updatedContent += String.Join(",", row.ToArray()) + Environment.NewLine;
    }

    File.WriteAllText(filePath, updatedContent);
}