最好的重载方法匹配... c #databounditem

i am trying to pass selected row from datagridview1 (form1) to datagridview1(form 4) and this is my list of codes..but i am getting error. As my programming skill isn't very well, do explain in details if you can clarify the problem... thanks.

我试图将选定的行从datagridview1(form1)传递到datagridview1(表单4),这是我的代码列表..但我收到错误。由于我的编程技巧不是很好,如果你能澄清问题,请详细解释......谢谢。

        if (tableListBox.SelectedIndex == 2)
        {
            List<string> sendingList = new List<string>();
            foreach (DataGridViewRow dr in dataGridView1.SelectedRows)
            {
                int counter = 0;
                sendingList.Add(dr.DataBoundItem);// The best overload method match for 'System.Collections.Generic.List<string>.Add(string)' has some invalid argument

            }
            Form4 form4 = new Form4(sendingList);
            form4.Show();

        }

2 个解决方案

#1

You need to either change the type of your list to objects, or convert your object to a string (using 'dr.DataBoundItem as string'). SendingList is a list of strings, so you can't add an object to it without converting it first.

您需要将列表类型更改为对象,或将对象转换为字符串(使用'dr.DataBoundItem as string')。 SendingList是一个字符串列表,因此您无法在不首先转换对象的情况下向其添加对象。

To convert the object to a string (assuming it is a string that was converted to an object):

要将对象转换为字符串(假设它是转换为对象的字符串):

sendingList.Add(dr.DataBoundItem as string);

#2

The reason you are getting that error is because your type doesn't match. If you look at DataGridViewRow.DataBoundItem you can see that it is defined as follows.

您收到该错误的原因是您的类型不匹配。如果查看DataGridViewRow.DataBoundItem,您可以看到它的定义如下。

public Object DataBoundItem { get; }

This means that the return type is Object. The error is because the List<T>.Add() method expects the parameter to be of type T in your case List<string>.Add(string). The list should be the of the type that DataBoundItem can be cast into. Looking at the example in the help page...

这意味着返回类型是Object。该错误是因为List .Add()方法期望参数在您的案例List .Add(string)中为T类型。该列表应该是DataBoundItem可以转换为的类型。查看帮助页面中的示例...

void invoiceButton_Click(object sender, EventArgs e)
{
    foreach (DataGridViewRow row in this.dataGridView1.SelectedRows)
    {
        Customer cust = row.DataBoundItem as Customer;
        if (cust != null)
        {
            cust.SendInvoice();
        }
    }
}

The DataBoundItem is cast as a Customer object. And if you wanted to capture them into a list it would be a List<Customer>. You could also use a List<object> however it is preferred that objects are strongly typed.

DataBoundItem被强制转换为Customer对象。如果您想将它们捕获到列表中,那么它将是List 。您也可以使用List

#1