[英]get index of DataTable column with name
I have some code which sets the value of cells in a DataRow by column name ie 我有一些代码通过列名设置DataRow中的单元格的值,即
row["ColumnName"] = someValue;
I want to also set the value for this row in the column immediately to the right of the one found above. 我还要将列中此行的值设置在上面找到的那一行的右侧。 Clearly if I was getting the cell by index rather than by column name this would be easy.
显然,如果我通过索引而不是按列名获取单元格,这将很容易。 So is there a way of getting the column index from the column name thus allowing me to do:
那么有没有办法从列名中获取列索引,从而允许我这样做:
row[index + 1] = someOtherValue;
ie do I need create some kind of dictionary of column index and column names when the table is initially created, or can I get the index from the column name later on without doing this? 即,我是否需要在最初创建表时创建某种列索引和列名称的字典,或者我可以稍后从列名称中获取索引而不执行此操作?
You can use DataColumn.Ordinal
to get the index of the column in the DataTable
. 您可以使用
DataColumn.Ordinal
来获取DataTable
列的索引。 So if you need the next column as mentioned use Column.Ordinal + 1
: 因此,如果您需要提到的下一列,请使用
Column.Ordinal + 1
:
row[row.Table.Columns["ColumnName"].Ordinal + 1] = someOtherValue;
试试这个:
int index = row.Table.Columns["ColumnName"].Ordinal;
You can simply use DataColumnCollection.IndexOf 您只需使用DataColumnCollection.IndexOf即可
So that you can get the index of the required column by name then use it with your row: 这样您就可以按名称获取所需列的索引,然后将其与行一起使用:
row[dt.Columns.IndexOf("ColumnName")] = columnValue;
I wrote an extension method of DataRow which gets me the object via the column name. 我写了一个DataRow的扩展方法,通过列名获取对象。
public static object Column(this DataRow source, string columnName)
{
var c = source.Table.Columns[columnName];
if (c != null)
{
return source.ItemArray[c.Ordinal];
}
throw new ObjectNotFoundException(string.Format("The column '{0}' was not found in this table", columnName));
}
And its called like this: 它的召唤如下:
DataTable data = LoadDataTable();
foreach (DataRow row in data.Rows)
{
var obj = row.Column("YourColumnName");
Console.WriteLine(obj);
}
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