C# 读取Excel数据 并对日期是数字的进行处理

//按钮事件

protected void btnQueryExcel_Click(object sender, EventArgs e)

{

DataSet ds; string strError;

string SaveFilePath = Server.MapPath(Page.Request.ApplicationPath) + "//UpLoadExcel";

if (!System.IO.Directory.Exists(SaveFilePath))

System.IO.Directory.CreateDirectory(SaveFilePath);

if (FileUpload1.FileName.Trim() =="")

{

alert("请选择要导入的Excel");

return;

}

FileUpload1.SaveAs(SaveFilePath + "//" + FileUpload1.FileName);

string Sql = "SELECT * FROM [CCS$];";

bool bRet = ImportDataFromExcelToDs(out ds, SaveFilePath + "//" + FileUpload1.FileName, Sql, out strError);

if (!bRet)

{

alert(strError);

return;

}

if (ds.Tables.Count == 0 && ds.Tables[0].Rows.Count > 0)

{

alert("没有数据");

return;

}

if (!QueryExcelData(ds, out strError))

{

alert(strError);

return;

}

}

/// <summary>

/// 将DataSet当中的数据导入到Excel当中

/// </summary>

/// <param name="ds"></param>

/// <param name="strError"></param>

/// <returns></returns>

private bool QueryExcelData(DataSet ds, out string strError)

{

gvClient.DataSource = null;

gvClient.DataBind();

strError = "";

List<ClientStructure> datas = new List<ClientStructure>();

try

{

#region 给对象赋值

for (int i = 0; i < ds.Tables[0].Rows.Count; i++)

{

DataRow dr = ds.Tables[0].Rows[i];

ClientStructure data = new ClientStructure();

//序号（展现用）

data.SN = i + 1;

//公司ID

data.CorpID = CheckUser().CorpID;

//客户名称（暂无用）

data.ClientName = dr[0].ToString().Replace("/n","");

if (data.ClientName == "")

{

break;

}

//客户编码(根据客户编码查询客户ID)

data.ClientKey = dr[1].ToString().Replace("/n", "");

if (data.ClientKey == "")

{

break;

}

//月份 查询数据格式为数字

try

{

data.RecordMonth = DateTime.FromOADate(Convert.ToInt32(dr[2].ToString())).ToString

("yyyy-MM");

}

catch

{

data.RecordMonth = "";

}

//月份，查询数据格式为日期格式

try

{

if (data.RecordMonth=="")

{

data.RecordMonth = Convert.ToDateTime(dr[2].ToString()).ToString("yyyy-MM");

}

}

catch

{

data.RecordMonth = "";

}

//将对象添加到集合当中

datas.Add(data);

}

#endregion

}

catch (System.Exception e)

{

strError = e.Message;

return false;

}

gvClient.DataSource = datas;

gvClient.DataBind();

ViewState["data"] = datas;

return true;

//ClientStructureManager manager = new ClientStructureManager();

//return manager.AddClientStructureFromExcel(datas, out strError);

}

private bool ImportDataFromExcelToDs(out System.Data.DataSet ds, string FileName, string Sql, out string strError)

{

ds = new DataSet();

strError = "";

string Connection = GetConn(FileName);

if (Connection.Equals(""))

{

strError = "所选文件不是Excel";

return false;

}

System.Data.OleDb.OleDbConnection OConnection = new System.Data.OleDb.OleDbConnection(Connection);

try

{

System.Data.OleDb.OleDbCommand Ocmd = new System.Data.OleDb.OleDbCommand(Sql, OConnection);

System.Data.OleDb.OleDbDataAdapter adp = new System.Data.OleDb.OleDbDataAdapter(Ocmd);

OConnection.Open();

adp.Fill(ds);

OConnection.Close();

}

catch

{

if (OConnection.State == ConnectionState.Open)

OConnection.Close();

}

return true;

}

private string GetConn(string FileName)

{

int index = FileName.LastIndexOf(".");

string suffix = FileName.Substring(index + 1);

if (suffix.Equals("xls"))

return "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + FileName + ";Extended Properties=Excel 8.0;";

else if (suffix.Equals("xlsx"))

return "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + FileName + ";Extended Properties=Excel 12.0;";

else

return "";

}