C# for 循环。索引超出范围

Question

我收到以下错误:

Index was outside the bounds of the array

for循环代码:

for (int i = 0; i < listEquipment.Items.Count - 1; i++)
{
   SqlCommand cmd = new SqlCommand("INSERT INTO [dbo].[EquipmentItems] ([RequestID], [TypeID]) VALUES (@RequestID, @TypeID)", conn);
   cmd.Parameters.Add("@RequestID", SqlDbType.Int).Value = userRequest;
   cmd.Parameters.Add("@TypeID", SqlDbType.Int).Value = (listEquipment.SelectedItems[i] as Equipment).equipmentID;
   cmd.ExecuteNonQuery();
}

出错的行:

cmd.Parameters.Add("@TypeID", SqlDbType.Int).Value = (listEquipment.SelectedItems[i] as Equipment).equipmentID;

求助!我是编程新手。

Answer 1

您循环所有项目，然后在 listEquipment.SelectedItems[i] 中访问该索引。但是可能没有选择所有项目，这意味着这个集合较小，您无法访问它。

所以我假设你不想循环所有项目而只是选择，所以使用:

for (int i = 0; i < listEquipment.SelectedItems.Count; i++)
{

}