c# - 将行值添加到具有 AutoIncreamented DataColumn 的 DataTable

Question

我想在具有自动增量属性的数据列的数据表中添加一行。

DataTable tblproduct = new DataTable();

DataColumn CartItemId = new DataColumn();
CartItemId.ColumnName = "CartItemId";
CartItemId.DataType = System.Type.GetType("System.Int32");
CartItemId.AutoIncrement = true;
CartItemId.AutoIncrementSeed = 1;
CartItemId.AutoIncrementStep = 1;
CartItemId.ReadOnly = true;
CartItemId.Unique = true;

tblproduct.Columns.Add(CartItemId);
tblproduct.Columns.Add("CampaignId", typeof(int));
tblproduct.Columns.Add("SubCatId", typeof(int));
tblproduct.Columns.Add("Size", typeof(string));
tblproduct.Columns.Add("Qty", typeof(int));

tblproduct.Rows.Add(3, 345,"Hello", 1);
tblproduct.Rows.Add(5, 3455,"Hecfghhgdfllo", 8);

我不想在 Autoincreamented 列中插入值。它应该是自动生成的值，但上面的代码对我不起作用。

Answer 1

添加行时，尝试类似的方法

        DataRow dr = tblproduct.NewRow();
        dr["CampaignId"] = 3;
        dr["SubCatId"] = 345;
        dr["Size"] = "Hello";
        dr["Qty"] = 1;
        tblproduct.Rows.Add(dr);

同样来自 DataColumn.AutoIncrement Property

You can create a new row using the ItemArray property of the DataRow class and passing in an array of values. This is a potential problem for a column with its AutoIncrement set to true, because its value is generated automatically. To use the ItemArray property, place null in the column's position in the array.

将您的代码更改为类似

        tblproduct.Rows.Add(null,3, 345, "Hello", 1);
        tblproduct.Rows.Add(null,5, 3455, "Hecfghhgdfllo", 8);