在数据绑定DataGridView中添加条目 [英] Add entry into databound DataGridView

问题描述

嗨伙计们，



用户应该可以编辑这些可爱的小型演示对象列表：

Hi folks,

user shall be able to edit a list of these cute little demo objects:

class Foo
{
    public int FirstCol { get; set; }
    public int SecondCol { get; set; }
    public Foo(int first, int second)
    {
        FirstCol = first;
        SecondCol = second;
    }
}


public void WindowsFormsMethod()
{
    BindingList<Foo> list = new BindingList<Foo>();
    list.Add(new Foo(1, 2));
    list.Add(new Foo(2, 3));
    list.Add(new Foo(42, 32));

    dgvEditor.DataSource = bla;
    // dgvEditor.AllowUserToAddRows is already true
}

并且通过编辑，我的意思是他可以改变值，它可以工作，_和_添加新行，但不是。如何让用户添加行？

And by "edit", I mean he can change values, which works, _and_ add new rows, which doesn't. How can I enable user to add rows?

推荐答案

As a result of googling a lot I've come to a decision that actually there is no way to add new row to a datagridview which has a binding source.However I am not sure at all.But According to your need I am giving you a solution I think it works for you fine.Please check it.Thanks

public Form1()
  {
      InitializeComponent();
      BindingList<foo> list = new BindingList<foo>();
      list.Add(new Foo(1, 2));
      list.Add(new Foo(2, 3));
      list.Add(new Foo(42, 32));
      list.Add(new Foo(0, 0));
      dgvEditor.Columns.Add("FirstCol", "First Column");
      dgvEditor.Columns.Add("SecondCol", "Second Column");
      int count=0;
      foreach (Foo f in list)
      {
          dgvEditor.Rows.Add();
          dgvEditor[0, count].Value = f.FirstCol;
          dgvEditor[1, count].Value = f.FirstCol;
          count++;

      }
 }

解决方案是添加无参数的Foo构造函数。

The solution is to add a parameterless Foo constructor.

class Foo
{
    public int FirstCol { get; set; }
    public int SecondCol { get; set; }

    // This c'tor is needed for the user
    //   to add entries from within
    //   a databound DataGridView.
    public Foo()
    { }

    public Foo(int first, int second)
    {
        FirstCol = first;
        SecondCol = second;
    }
}


public void WindowsFormsMethod()
{
    BindingList<Foo> list = new BindingList<Foo>();
    list.Add(new Foo(1, 2));
    list.Add(new Foo(2, 3));
    list.Add(new Foo(42, 32));

    dgvEditor.DataSource = list;
    // dgvEditor.AllowUserToAddRows is already true
}

我试图避免这种情况，因为参数化的c'tor检查了它作为参数得到的值。将不得不以另一种方式执行这些。

Which I tried to avoid because the parameterized c'tor did some checking of the values it got as parameters. Will have to perform those in another way.

这篇关于在数据绑定DataGridView中添加条目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！