出于某种原因,当我尝试使用此代码从 Access 数据库中读取数字时,我的数据网格中出现了空白条目。我可以很好地阅读字符串。有谁知道这可能是为什么?是的,Access 中未读条目的实际数据类型是数字。
string strProvider = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Employees.mdb";
string strSql = "SELECT * FROM tbl_employees";
OleDbConnection con = new OleDbConnection(strProvider);
OleDbCommand cmd = new OleDbCommand(strSql, con);
con.Open();
cmd.CommandType = CommandType.Text;
OleDbDataReader dr = cmd.ExecuteReader();
int columnCount = dr.FieldCount;
for (int i = 0; i < columnCount; i++)
{
dgv.Columns.Add(dr.GetName(i).ToString(), dr.GetName(i).ToString());
}
string[] rowData = new string[columnCount];
while (dr.Read())
{
for (int k = 0; k < columnCount; k++)
{
if (dr.GetFieldType(k).ToString() =="System.Int32")
{
rowData[k] = dr.GetInt32(k).ToString();
}
if (dr.GetFieldType(k).ToString() == "System.String")
{
rowData[k] = dr.GetString(k);
}
}
dgv.Rows.Add(rowData);
}