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  • C# 处理csv格式的Excel文件代码

    public class CSVFileHelper
    {
    /// <summary>
    /// 将DataTable中数据写入到CSV文件中
    /// </summary>
    /// <param name="dt">提供保存数据的DataTable</param>
    /// <param name="fileName">CSV的文件路径</param>
    public static void SaveCSV(DataTable dt, string fullPath)
    {
    FileInfo fi = new FileInfo(fullPath);
    if (!fi.Directory.Exists)
    {
    fi.Directory.Create();
    }
    FileStream fs = new FileStream(fullPath, System.IO.FileMode.Create, System.IO.FileAccess.Write);
    //StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);
    StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
    string data = "";
    //写出列名称
    for (int i = 0; i < dt.Columns.Count; i++)
    {
    data += dt.Columns[i].ColumnName.ToString();
    if (i < dt.Columns.Count - 1)
    {
    data += ",";
    }
    }
    sw.WriteLine(data);
    //写出各行数据
    for (int i = 0; i < dt.Rows.Count; i++)
    {
    data = "";
    for (int j = 0; j < dt.Columns.Count; j++)
    {
    string str = dt.Rows[i][j].ToString();
    str = str.Replace(""", """");//替换英文冒号 英文冒号需要换成两个冒号
    if (str.Contains(',') || str.Contains('"')
    || str.Contains(' ') || str.Contains(' ')) //含逗号 冒号 换行符的需要放到引号中
    {
    str = string.Format(""{0}"", str);
    }

    data += str;
    if (j < dt.Columns.Count - 1)
    {
    data += ",";
    }
    }
    sw.WriteLine(data);
    }
    sw.Close();
    fs.Close();
    DialogResult result = MessageBox.Show("CSV文件保存成功!");
    if (result == DialogResult.OK)
    {
    //System.Diagnostics.Process.Start("explorer.exe", Common.PATH_LANG);
    }
    }

    /// <summary>
    /// 将CSV文件的数据读取到DataTable中
    /// </summary>
    /// <param name="fileName">CSV文件路径</param>
    /// <returns>返回读取了CSV数据的DataTable</returns>
    public static DataTable OpenCSV(string filePath)
    {

    //Encoding encoding = Common.GetType(filePath); //Encoding.ASCII;//
    DataTable dt = new DataTable();
    FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);

    //StreamReader sr = new StreamReader(fs, Encoding.UTF8);
    StreamReader sr = new StreamReader(fs, Encoding.Default);
    //string fileContent = sr.ReadToEnd();
    //encoding = sr.CurrentEncoding;
    //记录每次读取的一行记录
    string strLine = "";
    //记录每行记录中的各字段内容
    string[] aryLine = null;
    string[] tableHead = null;
    //标示列数
    int columnCount = 0;
    //标示是否是读取的第一行
    bool IsFirst = true;
    //逐行读取CSV中的数据
    while ((strLine = sr.ReadLine()) != null)
    {

    if (IsFirst == true)
    {
    tableHead = strLine.Split(',');
    IsFirst = false;
    columnCount = tableHead.Length;
    //创建列
    for (int i = 0; i < columnCount; i++)
    {
    DataColumn dc = new DataColumn(tableHead[i]);
    dt.Columns.Add(dc);
    }
    }
    else
    {
    aryLine = strLine.Split(',');
    DataRow dr = dt.NewRow();
    for (int j = 0; j < aryLine.Length; j++)
    {
    dr[j] = aryLine[j];
    }
    dt.Rows.Add(dr);
    }
    }
    if (aryLine != null && aryLine.Length > 0)
    {
    dt.DefaultView.Sort = tableHead[0] + " " + "asc";
    }

    sr.Close();
    fs.Close();
    return dt;
    }
    }

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  • 原文地址:https://www.cnblogs.com/xiao-bei/p/4065188.html
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