C#中Datatable转Excel
Datatable另存为Excel的方法,Datatable导出到Excel的方法
在数据程序的开放中,有时需要把数据中的查询结果保存到Excel文件中,下面的过程实现了这个功能.
使用说明:参数excel为要保存的excel文件名;tb为内存中的有数据的Datatable;tbname是插入到excel文件中的工作表的名称.程序中已经对部分数据类型进行了分别处理,如有特殊需要请自己修改!
static public void TableToExcel(string excel, DataTable tb,string tbname)
{
try
{
OleDbConnection connex = GetConnFromExcel(excel); //获取到excel文件的oledb连接
string ct = "CREATE TABLE " + tbname + " ("; //以下生成一个sql命令向excel中插入一个表
foreach (DataColumn clmn in tb.Columns)
{
switch (clmn.DataType.Name) //根据不同数据类型分别处理
{
case "Decimal":
ct += clmn.ColumnName + " Decimal,";
break;
case "Double":
ct += clmn.ColumnName + " Double,";
break;
default:
ct += clmn.ColumnName + " string,";
break;
}
}
ct = ct.Substring(0, ct.Length - 1) + ")";
OleDbCommand cmd1 = new OleDbCommand(ct, connex);
cmd1.ExecuteNonQuery(); //向excel中插入一个表
foreach (DataRow r in tb.Rows) //下面向excel中一行一行写入数据
{
string fs = "", vs = "";
foreach (DataColumn clmn in tb.Columns)
{
fs += clmn.ColumnName + ",";
if (r[clmn.ColumnName] == DBNull.Value)
{
vs += "null,";
continue;
}
switch (clmn.DataType.Name) //根据不同数据类型分别处理
{
case "Decimal":
vs += ((decimal)r[clmn.ColumnName]).ToString("0.00") + ",";
break;
case "Double":
vs += ((double)r[clmn.ColumnName]).ToString("0.00") + ",";
break;
case "DateTime":
vs += "'" + ((DateTime)r[clmn.ColumnName]).ToShortDateString() + "',";
break;
default:
vs += "'" + r[clmn.ColumnName].ToString() + "',";
break;
}
}
string sqlstr = "insert into [" + tbname + "$] (" + fs.Substring(0, fs.Length - 1) + ") values (" + vs.Substring(0, vs.Length - 1) + ")";
OleDbCommand cmd = new OleDbCommand(sqlstr, connex);
cmd.ExecuteNonQuery(); //向excel中插入数据
}
connex.Close();
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
