C# 如何设置列长度和类型
我正在从C# 如何设置列长度和类型,c#,asp.net,excel,datatable,ado.net,C#,Asp.net,Excel,Datatable,Ado.net,我正在从xls/xlsx文件读取到数据集 string connstring; if (currFileExtension == ".xlsx") { connstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + currFilePath + ";Extended Properties='Excel 8.0;HDR=NO;IMEX=1';";
xls/xlsx
文件读取到数据集
string connstring;
if (currFileExtension == ".xlsx")
{
connstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + currFilePath + ";Extended Properties='Excel 8.0;HDR=NO;IMEX=1';";
}
else
{
connstring = "Provider=Microsoft.JET.OLEDB.4.0;Data Source=" + currFilePath + ";Extended Properties='Excel 8.0;HDR=NO;IMEX=1';";
}
using (OleDbConnection conn = new OleDbConnection(connstring))
{
conn.Open();
DataTable sheetsName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" }); //Get All Sheets Name
string firstSheetName = sheetsName.Rows[0][2].ToString(); //Get the First Sheet Name
string sql = string.Format("SELECT * FROM [{0}]", firstSheetName); //Query String
OleDbDataAdapter ada = new OleDbDataAdapter(sql, connstring);
DataSet set = new DataSet();
ada.Fill(set);
}
其中一列是字符串,在255个字符后被剪切
如何在填充数据集之前设置列?
可能是excel的问题,我需要更改excel中的列?您可以将定义的数据表添加到数据集 以下是代码:
DataSet dataSet = new DataSet();
DataTable customTable = new DataTable();
DataColumn dcName = new DataColumn("Name", typeof(string));
dcName.MaxLength= 500;
customTable.Columns.Add(dcName);
dataSet.Tables.Add(customTable);