关于WINCE 上 C#无法追加一行到文本文件上的问题

public bool AppendRecord(string fileName, SoilInfo.Record record)
{
FileStream fs = new FileStream(fileName, FileMode.Append);
StreamWriter sw = new StreamWriter(fs);
if (sw == null)
{
MessageBox.Show("没有找到文件，或文件正在被占用", "错误");
return false;
}

    record.ProjectName +=  ",";
    record.SoilModelName +=  ",";
    record.Wet +=  ",";
    record.SoilDensity += ",";
    record.recordDescription +=  ",";
    record.language += "\r\n";
    string str = record.ProjectName + record.SoilModelName + record.Wet + record.SoilDensity + record.recordDescription + record.language;
    try
    {
        sw.WriteLine(str);

    }
    finally
    {
        sw.Dispose();
    }
    sw.Close();
    fs.Close();
    return true;
}

    代码如上所示

File.AppendAllText(文件名,内容)即可