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public static class ExcelHelper
{
#region 导入
/// <summary>
/// 导入EXCEL（默认的sheet）
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public static System.Data.DataTable ImpExcelDt(string fileName)
{
return ImpExcelDt(fileName, "Sheet1");
}
/// <summary>
/// excel 导入
/// </summary>
/// <param name="fileName"></param>
/// <param name="sheetName"></param>
/// <returns></returns>
public static System.Data.DataTable ImpExcelDt(string fileName, string sheetName)
{
try
{
if (!File.Exists(fileName))
{
return null;
}
string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";Extended Properties='Excel 8.0;HDR=False;IMEX=1'";
OleDbConnection myConn = new OleDbConnection(strCon);
string strCom = " SELECT * FROM [" + sheetName + "$] ";
myConn.Open();
OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, myConn);
DataSet myDataSet = new DataSet();
myCommand.Fill(myDataSet, "[" + sheetName + "$]");
myConn.Close();
System.Data.DataTable dt = myDataSet.Tables[0];
return dt;
}
catch(Exception ex)
{
throw ex;
}
}
#endregion
#region 导出到EXCEL
/// <summary>
/// 将数据导出到指定的Excel文件中
/// </summary>
/// <param name="listView">System.Windows.Forms.ListView,指定要导出的数据源</param>
/// <param name="destFileName">指定目标文件路径</param>
/// <param name="tableName">要导出到的表名称</param>
/// <param name="overWrite">指定是否覆盖已存在的表</param>
/// <returns>导出的记录的行数</returns>
public static int ExportToExcel(System.Data.DataTable dt, string destFileName, string tableName)
{
if (File.Exists(destFileName))
{
File.Delete(destFileName);
}
//得到字段名
string szFields = "";
string szValues = "";
for (int i = 0; i < dt.Columns.Count; i++)
{
szFields += "[" + dt.Columns[i] + "],";
}
szFields = szFields.TrimEnd(',');
//定义数据连接
OleDbConnection connection = new OleDbConnection();
connection.ConnectionString = GetConnectionString(destFileName);
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandType = CommandType.Text;
//打开数据库连接
try
{
connection.Open();
}
catch
{
throw new Exception("目标文件路径错误。");
}
//创建数据库表
try
{
command.CommandText = GetCreateTableSql("[" + tableName + "]", szFields.Split(','));
command.ExecuteNonQuery();
}
catch (Exception ex)
{
//如果允许覆盖则删除已有数据
throw ex;
}
try
{
//循环处理数据------------------------------------------
int recordCount = 0;
for (int i = 0; i < dt.Rows.Count; i++)
{
szValues = "";
for (int j = 0; j < dt.Columns.Count; j++)
{
szValues += "'" + dt.Rows[i][j] + "',";
}
szValues = szValues.TrimEnd(',');
//组合成SQL语句并执行
string szSql = "INSERT INTO [" + tableName + "](" + szFields + ") VALUES(" + szValues + ")";
command.CommandText = szSql;
recordCount += command.ExecuteNonQuery();
}
connection.Close();
return recordCount;
}
catch (Exception ex)
{
throw ex;
}
}
//得到连接字符串
private static String GetConnectionString(string fullPath)
{
string szConnection;
szConnection = "Provider=Microsoft.JET.OLEDB.4.0;Extended Properties=Excel 8.0;data source=" + fullPath;
return szConnection;
}
//得到创建表的SQL语句
private static string GetCreateTableSql(string tableName, string[] fields)
{
string szSql = "CREATE TABLE " + tableName + "(";
for (int i = 0; i < fields.Length; i++)
{
szSql += fields[i] + " VARCHAR(200),";
}
szSql = szSql.TrimEnd(',') + ")";
return szSql;
}
#endregion
}
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