错误：找不到类型或命名空间名称“SqlCe”（您是否缺少 using 指令或程序集引用？）

Question

I'm trying to export my data from a dataGridView to an excel file. It works like charm, but I just want to have the name of the columns too. I wrote the following code, but I can't get it with this error. Thanks !

Error: The type or namespace name 'SqlCe' could not be found (are you missing a using directive or an assembly reference?)

Code:

foreach (SqlCe.Data.DataColumn dc in dataGridView1.Columns)
                colNames[col++] = dc.ColumnName;

char lastColumn = (char)(65 + dataGridView1.Columns.Count - 1);

xlWorkSheet.get_Range("A1", lastColumn + "1").Value2 = colNames;
xlWorkSheet.get_Range("A1", lastColumn + "1").Font.Bold = true;
xlWorkSheet.get_Range("A1", lastColumn + "1").VerticalAlignment= Excel.XlVAlign.xlVAlignCenter;

The reference for SQL Server CE: using System.Data.SqlServerCe;

Answer 1

There is no type called SqlCe as far as I can see... for the DataColumn type, you should just be using System.Windows.Forms.DataGridViewColumn , ideally via a using directive for System.Windows.Forms . Note that DataGridViewColumn doesn't have a ColumnName property, but it does have a Name property:

using System.Windows.Forms;
...
foreach (DataGridViewColumn  dc in dataGridView1.Columns)
{
    colNames[col++] = dc.Name;
}

There's no need to refer to SqlCe there, because a DataGridView isn't provider-specific.

Also note that if colNames just contains these column names, you could use:

var colNames = dataGridView1.Columns
                            .Cast<DataGridViewColumn>()
                            .Select(c => c.Name)
                            .ToArray(); // Or ToList