使用C＃將Excel數據轉換為日期時間

Question

我是C＃的新手，我有一個C＃程序和一個從另一個程序導出的excel文件。 如何將其轉換為DateTime？ 這是代碼，其中dtFrom和dtTo是DateTimePicker變量：

System.Data.DataTable dtExcel = new System.Data.DataTable();
dtExcel.TableName = "MyExcelData";
string SourceConstr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" +        this.textBox1.Text + "';Extended Properties= 'Excel 8.0;HDR=Yes;IMEX=1'";
OleDbConnection con = new OleDbConnection(SourceConstr);
string query = "Select Customer, SUM(Wt) AS Weight from [Sheet0$] WHERE (CONVERT(datetime, [Date]) >= " + this.dtFrom.Value.Month + ") GROUP BY Customer order by Customer"; 
OleDbDataAdapter data = new OleDbDataAdapter(query, con);
data.Fill(dtExcel);

Answer 1

我認為這可能不是您唯一的問題，而是如果您替換則回答您的問題

string query = "Select Customer, SUM(Wt) AS Weight from [Sheet0$] WHERE (CONVERT(datetime, [Date]) >= " + this.dtFrom.Value.Month + ") GROUP BY Customer order by Customer"; 
OleDbDataAdapter data = new OleDbDataAdapter(query, con);

與

string query = "Select Customer, SUM(Wt) AS Weight from [Sheet0$] WHERE (CONVERT(datetime, [Date]) >= @Date) GROUP BY Customer order by Customer"; 
OleDbCommand command = new OleDbCommand(query);
command.Parameters.Add("@Date", OleDbType.DBTimeStamp).Value = this.dtFrom.Value;
OleDbDataAdapter data = new OleDbDataAdapter(command, con);

您可能會走上正確的道路。 不能100％確切地OleDbType您需要哪種OleDbType ，但是您可以很容易地看到可用的選項。