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使用ADO.net将数据导出到Excel并提供下载 RRS feed

  • 常规讨论

  • public string DataTableToExcel(DataTable dt,string excelPath)
    {
    if(dt == null)
    {
    return "DataTable不能为空";
    }

    int rows = dt.Rows.Count;
    int cols = dt.Columns.Count;
    StringBuilder sb;
    string connString;

    if(rows == 0)
    {
    return "没有数据";
    }

    sb = new StringBuilder();
    connString = string.Format(ConnectionString,excelPath);

    //生成创建表的脚本
    sb.Append("CREATE TABLE ");
    sb.Append(dt.TableName + " ( ");

    for(int i=0;i<cols;i++)
    {
    if(i < cols - 1)
    sb.Append(string.Format("{0} varchar,",dt.Columns[i].ColumnName));
    else
    sb.Append(string.Format("{0} varchar)",dt.Columns[i].ColumnName));
    }

    using(OleDbConnection objConn = new OleDbConnection(connString))
    {
    OleDbCommand objCmd = new OleDbCommand();
    objCmd.Connection = objConn;

    objCmd.CommandText = sb.ToString();

    try
    {
    objConn.Open();
    objCmd.ExecuteNonQuery();
    }
    catch(Exception e)
    {
    return "在Excel中创建表失败,错误信息:" + e.Message;
    }

    生成插入数据脚本#region 生成插入数据脚本
    sb.Remove(0,sb.Length);
    sb.Append("INSERT INTO ");
    sb.Append(dt.TableName + " ( ");

    for(int i=0;i<cols;i++)
    {
    if(i < cols - 1)
    sb.Append(dt.Columns[i].ColumnName + ",");
    else
    sb.Append(dt.Columns[i].ColumnName + ") values (");
    }

    for(int i=0;i<cols;i++)
    {
    if(i < cols - 1)
    sb.Append("@" + dt.Columns[i].ColumnName + ",");
    else
    sb.Append("@" + dt.Columns[i].ColumnName + ")");
    }
    #endregion


    //建立插入动作的Command
    objCmd.CommandText = sb.ToString();
    OleDbParameterCollection param = objCmd.Parameters;

    for(int i=0;i<cols;i++)
    {
    param.Add(new OleDbParameter("@" + dt.Columns[i].ColumnName,

    OleDbType.VarChar));
    }

    //遍历DataTable将数据插入新建的Excel文件中
    foreach (DataRow row in dt.Rows)
    {
    for (int i=0; i<param.Count; i++)
    {
    param[i].Value = row[i];
    }

    objCmd.ExecuteNonQuery();
    }

    return "数据已成功导入Excel";
    }//end using
    }

    2009年5月31日 6:58