bindingsource.addnew之后怎样给datatable当前行赋一些初始值?

Question

bindingsource调用addnew()之后, 怎样给bindingsource绑定的datatable的当前行(刚刚新增的行)赋一些初始值? 也就是说怎样取得datatable新增的行对象?

Answer 1

你好！

在 BindingSource.AddingNew 的事件中初始你需要的值。

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Answer 2

谢谢你的回答, 我知道在里面写, 但是不知道怎么写, 不知道当前行对象怎么取得, 能不能写个例子?

比如:
                  private   void   bsEmployees_AddingNew(object   sender,   AddingNewEventArgs   e)  
                  {   
                          ...

                          newRow["ID"]   =   1;
                          newRow["Name"]   =   "myname";  

                          ...
                  }

那个newRow对象我怎么取得??

Answer 3

你好！
     通过设置e.NewObject属性来实现：

void customersBindingSource_AddingNew(
    object sender, 
    AddingNewEventArgs e)
{
    e.NewObject = DemoCustomer.CreateNewCustomer();
}

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周雪峰

Answer 4

还是不明白,

e.NewObject = DemoCustomer.CreateNewCustomer(); 是什么意思?
新增的行对象怎么得到??? e.NewObject 就是我要的行对象吗?

能不能帮我改一下下面的代码:
                  private   void   bsEmployees_AddingNew(object   sender,   AddingNewEventArgs   e)  
                  {   
                          ...

                          newRow["ID"]   =   1;
                          newRow["Name"]   =   "myname";  

                          ...
                  }

在赋值之前我怎么得到 newRow 这个对象???

Answer 5

你好！
     意思就是你自己构造一个新行，然后赋初始值，然后把这个行赋值给e.NewObject!

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周雪峰

Answer 6

你好！

我写了个完整的示例，你看看。

using System;
using System.Data;
using System.Windows.Forms;

namespace X.WinForms.UI.Controls.DataGridView
{
    public partial class BindingSourceAddNew : Form
    {
        public BindingSourceAddNew()
        {
            InitializeComponent();

            this.InitData();
            this.InitUI();
        }

        private void BindingSourceAddNew_Load(object sender, EventArgs e)
        {
            this.AddDemo();
        }

        private System.Windows.Forms.DataGridView dataGridView1;
        private BindingSource bs;
        private DataTable dt;

        private void InitData()
        {
            this.dt = new DataTable();

            this.dt.Columns.Add("Id", typeof(Guid));
            this.dt.Columns.Add("Name", typeof(string));

            this.dt.Rows.Add(new object[] { Guid.NewGuid(), "Name1" });
            this.dt.Rows.Add(new object[] { Guid.NewGuid(), "Name2" });

            this.bs = new BindingSource(this.dt, null);
            this.bs.AddingNew += new System.ComponentModel.AddingNewEventHandler(AddingNew);
        }

        private void AddingNew(object sender, System.ComponentModel.AddingNewEventArgs e)
        {
            // 添加默认行的方式
            DataView view = (DataView)this.bs.List;
            DataRowView newobj = view.AddNew();
            newobj["Id"] = Guid.NewGuid();
            newobj["Name"] = "default";
            e.NewObject = newobj;
        }

        private void InitUI()
        {
            this.dataGridView1 = new System.Windows.Forms.DataGridView();
            this.dataGridView1.Dock = DockStyle.Fill;
            this.dataGridView1.DataSource = this.bs;
            this.Controls.Add(this.dataGridView1);
        }

        /// <summary>
        /// AddNew 测试
        /// </summary>
        private void AddDemo()
        {
            for (int i = 0; i < 5; i++)
                this.bs.AddNew();
        }
    }
}

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知识改变命运，奋斗成就人生!