将DataGridView中的DataRow投射到自定义对象？

Question

I want to cast a DataRow to custom object, when I double click a row, so this it what sounds to me the right way doing it:

DataRowView selectedRow = (DataRowView)gv_Search.Rows[e.RowIndex].DataBoundItem;
//this to see the data, but the table contains all the rows in the grid
var table = selectedRow.DataView.ToTable();

the data in the grid is a view from SQL, I generated a class holding the same data the view returns, so I want when I double click the DataGridView the selected row is casted to the type I created

Answer 1

Your question is quite unclear, but if you want to cast some custom object to another one, you can use Conversion operator :

public static explicit operator DataRowView(VwCustomerSizes arg)
{
    DataRowView drv = new DataRowView();
    drv.Prop1 = (Prop1Type)arg.Prop1; //of course if they need casting
    drv.Prop2 = (Prop2Type)arg.Prop2;
    drv.Prop3 = (Prop3Type)arg.Prop3;
    . . .
    drv.PropN = (PropNType)arg.PropN;
    return drv;
}

Answer 2

DataRowView具有Row属性，该属性应该是您想要的VwCustomerSizes 。

Answer 3

I generated a class holding the same data the view returns, so I want when I double click the DataGridView the selected row is casted to the type I created

Use collection of this classes as DataSource for DataGridView

List<MyClass> allData = GetDataFromDatabase();
gv_Search.DataSource = allData;

Then on row click you can access selected instance of MyClass

var selected = (MyClass)gv_Search.Rows[e.RowIndex].DataBoundItem;

Console.WriteLine($"Selected Id = {selected.Id}"); // Use selected data

Inside GetDataFromDatabase you will read data from database straight to the instances of MyClass

var allItems = new List<MyClass>();
using (var connection = New SqlConnection(connectionString))
using (var command = New SqlCommand(query, connection))
{
    connection.Open();
    using (var reader = command.ExecuteReader())
    {
        while (reader.Read())
        {
            var item = new MyClass
            {
                Id = reader.GetInt32(0),
                Name = reader.GetString(1),
                Birthdate = reader.GetDatetime(2)
            };

            allItems.Add(item);
        }
    }
}

return allItems;