本文实例讲述了C#中DataBindings用法。分享给大家供大家参考，具体如下：
在C#操作数据库过程中，针对一般的文本控件，比如TextBox，Label等，我们赋值直接使用类似TextBox.Text=****的方式来进行，这种方式从某种意义上来说的确是最简便的方式，但是对于复杂一些的空间，比如说DataGridView，这个时候，绑定数据源我们一般使用DataGridView1.DataSource=****的方式来进行，如果数据源稍微有更改，那么只需要重新调用绑定一遍即可。可以说这种方式是单向的，也即从数据库到UI，但是有没有一种方式能够实现数据源改变的时候，不用重新绑定DataGridView就让它能够自动刷新数据呢，当然，这里要提到的就是DataBinding了。
代码如下
Form2.cs代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace DataBindingsTest
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
MyDataSource mydatasource = new MyDataSource(); //应用于第二种方式
public int Num { get ; set ; } //应用于第三种方式
public List<BlogNew> blogNews { get ; set ; } //应用于第四种方式
public BindingList<BlogNew> blogNewsRegardUI { get ; set ; } //应用于DataGridView界面UI更新
private void mainFrm_Load( object sender, EventArgs e)
{
#region 测试一
/************************************************
* 第一个值：要绑定到TextBox的什么地方
* 第二个值：数据源是什么
* 第三个值：应该取数据源的什么属性
* 第四个值：是否开启数据格式化
* 第五个值：在什么时候启用数据源绑定
* *********************************************/
textBox1.DataBindings.Add( "Text" , trackBar1, "Value" , false , DataSourceUpdateMode.OnPropertyChanged);
#endregion
#region 测试二
/*********************************************
* 这个主要就是通过一个外部的类，当做数据源
* *********************************************/
mydatasource.Myvalue = "这是个测试" ;
textBox2.DataBindings.Add( "Text" , mydatasource, "Myvalue" , false , DataSourceUpdateMode.OnPropertyChanged);
#endregion
#region 测试三
/*****************************************
*这个主要就是通过本身拥有的属性，当做数据源
****************************************/
Num = 5;
textBox3.DataBindings.Add( "Text" , this , "Num" , false , DataSourceUpdateMode.OnPropertyChanged);
#endregion
/*
* 注意：上面的3个测试，改变文本框中的值，数据源中对应的属性值会改变
* 但是，数据源的属性值改变了，文本框中的值不会改变
*/
#region 测试四 ： List<T>
blogNews = new List<BlogNew>();
blogNews.Add( new BlogNew { BlogID = 1, BlogTitle = "人生若只如初见" });
blogNews.Add( new BlogNew { BlogID = 2, BlogTitle = "何事秋风悲画扇" });
blogNews.Add( new BlogNew { BlogID = 3, BlogTitle = "最喜欢纳兰性德" });
dataGridView1.DataBindings.Add( "DataSource" , this , "blogNews" , false , DataSourceUpdateMode.OnPropertyChanged);
#endregion
#region 测试五 ： BindingList<T>
blogNewsRegardUI = new BindingList<BlogNew>();
blogNewsRegardUI.Add( new BlogNew { BlogID = 11, BlogTitle = "僵卧孤村不自哀" });
blogNewsRegardUI.Add( new BlogNew { BlogID = 12, BlogTitle = "尚思为国戍轮台" });
blogNewsRegardUI.Add( new BlogNew { BlogID = 13, BlogTitle = "夜阑卧听风吹雨" });
dataGridView2.DataBindings.Add( "DataSource" , this , "blogNewsRegardUI" , false , DataSourceUpdateMode.OnPropertyChanged);
#endregion
}
private void button1_Click( object sender, EventArgs e)
{
//从这里可以看出，改变了TextBox2中的值，这里的值也改变了，原因是因为类属于引用类型
MessageBox.Show(mydatasource.Myvalue);
}
private void button2_Click( object sender, EventArgs e)
{
//从这里可以看出，改变了TextBox3中的值，这里的值也改变了，
//原因是Num被当做了当前窗体的一个属性(窗体本身就是一个类)，也属于引用类型
MessageBox.Show(Num.ToString());
//this.Num = 10;
//MessageBox.Show(Num.ToString());
}
private void button3_Click( object sender, EventArgs e)
{
//在这里向DataGridView中插入一行
var data = dataGridView1.DataSource as List<BlogNew>;
data.Add( new BlogNew { BlogID = 4, BlogTitle = "取次花丛懒回顾，半缘修道半缘君" });
foreach (BlogNew blogNew in dataGridView1.DataSource as List<BlogNew>)
{
/***********
* 当我们心插入一条BlogID记录为4的数据的时候，在界面上可以看出dataGridView1的dataSource已经被更新，
* 但是界面上依旧显示为BlogID为1,2,3三条数据，很奇怪
* *********************/
MessageBox.Show(blogNew.BlogID + "--" + blogNew.BlogTitle);
}
}
private void button4_Click( object sender, EventArgs e)
{
/*这里主要用来解决DataGridView1界面不更新的问题，其实原因在于使用了List<BlogNew>,这里我们采用BindList<BlogNew>
*通过测试，我们发现，只要数据源改变，界面就可以自动的进行更新了，很是方便，不需要重新绑定
*/
var dataRegardUI = dataGridView2.DataSource as BindingList<BlogNew>;
dataRegardUI.Add( new BlogNew { BlogID = 20, BlogTitle = "竹外桃花三两枝，春江水暖鸭先知" });
}
}
public class MyDataSource
{
public string Myvalue { get ; set ; }
}
public class BlogNew
{
public int BlogID { get ; set ; }
public string BlogTitle { get ; set ; }
}
}
Form2.Designer.cs代码：
namespace DataBindingsTest
{
partial class Form2
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null ;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose( bool disposing)
{
if (disposing && (components != null ))
{
components.Dispose();
}
base .Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this .groupBox1 = new System.Windows.Forms.GroupBox();
this .groupBox2 = new System.Windows.Forms.GroupBox();
this .button1 = new System.Windows.Forms.Button();
this .textBox2 = new System.Windows.Forms.TextBox();
this .groupBox3 = new System.Windows.Forms.GroupBox();
this .button2 = new System.Windows.Forms.Button();
this .textBox3 = new System.Windows.Forms.TextBox();
this .groupBox4 = new System.Windows.Forms.GroupBox();
this .button3 = new System.Windows.Forms.Button();
this .dataGridView1 = new System.Windows.Forms.DataGridView();
this .groupBox5 = new System.Windows.Forms.GroupBox();
this .button4 = new System.Windows.Forms.Button();
this .dataGridView2 = new System.Windows.Forms.DataGridView();
this .textBox1 = new System.Windows.Forms.TextBox();
this .trackBar1 = new System.Windows.Forms.TrackBar();
this .groupBox1.SuspendLayout();
this .groupBox2.SuspendLayout();
this .groupBox3.SuspendLayout();
this .groupBox4.SuspendLayout();
((System.ComponentModel.ISupportInitialize)( this .dataGridView1)).BeginInit();
this .groupBox5.SuspendLayout();
((System.ComponentModel.ISupportInitialize)( this .dataGridView2)).BeginInit();
((System.ComponentModel.ISupportInitialize)( this .trackBar1)).BeginInit();
this .SuspendLayout();
//
// groupBox1
//
this .groupBox1.Controls.Add( this .trackBar1);
this .groupBox1.Controls.Add( this .textBox1);
this .groupBox1.Location = new System.Drawing.Point(12, 12);
this .groupBox1.Name = "groupBox1" ;
this .groupBox1.Size = new System.Drawing.Size(200, 100);
this .groupBox1.TabIndex = 0;
this .groupBox1.TabStop = false ;
this .groupBox1.Text = "方式一" ;
//
// groupBox2
//
this .groupBox2.Controls.Add( this .button1);
this .groupBox2.Controls.Add( this .textBox2);
this .groupBox2.Location = new System.Drawing.Point(218, 12);
this .groupBox2.Name = "groupBox2" ;
this .groupBox2.Size = new System.Drawing.Size(200, 100);
this .groupBox2.TabIndex = 2;
this .groupBox2.TabStop = false ;
this .groupBox2.Text = "方式二" ;
//
// button1
//
this .button1.Location = new System.Drawing.Point(22, 59);
this .button1.Name = "button1" ;
this .button1.Size = new System.Drawing.Size(157, 23);
this .button1.TabIndex = 3;
this .button1.Text = "查看已修改的数据源的值" ;
this .button1.UseVisualStyleBackColor = true ;
this .button1.Click += new System.EventHandler( this .button1_Click);
//
// textBox2
//
this .textBox2.Location = new System.Drawing.Point(22, 20);
this .textBox2.Name = "textBox2" ;
this .textBox2.Size = new System.Drawing.Size(157, 21);
this .textBox2.TabIndex = 2;
//
// groupBox3
//
this .groupBox3.Controls.Add( this .button2);
this .groupBox3.Controls.Add( this .textBox3);
this .groupBox3.Location = new System.Drawing.Point(428, 12);
this .groupBox3.Name = "groupBox3" ;
this .groupBox3.Size = new System.Drawing.Size(200, 100);
this .groupBox3.TabIndex = 4;
this .groupBox3.TabStop = false ;
this .groupBox3.Text = "方式三" ;
//
// button2
//
this .button2.Location = new System.Drawing.Point(22, 59);
this .button2.Name = "button2" ;
this .button2.Size = new System.Drawing.Size(157, 23);
this .button2.TabIndex = 3;
this .button2.Text = "查看已修改的数据源的值" ;
this .button2.UseVisualStyleBackColor = true ;
this .button2.Click += new System.EventHandler( this .button2_Click);
//
// textBox3
//
this .textBox3.Location = new System.Drawing.Point(22, 20);
this .textBox3.Name = "textBox3" ;
this .textBox3.Size = new System.Drawing.Size(157, 21);
this .textBox3.TabIndex = 2;
//
// groupBox4
//
this .groupBox4.Controls.Add( this .button3);
this .groupBox4.Controls.Add( this .dataGridView1);
this .groupBox4.Location = new System.Drawing.Point(12, 118);
this .groupBox4.Name = "groupBox4" ;
this .groupBox4.Size = new System.Drawing.Size(568, 157);
this .groupBox4.TabIndex = 5;
this .groupBox4.TabStop = false ;
this .groupBox4.Text = "方式四" ;
//
// button3
//
this .button3.Location = new System.Drawing.Point(377, 122);
this .button3.Name = "button3" ;
this .button3.Size = new System.Drawing.Size(157, 23);
this .button3.TabIndex = 4;
this .button3.Text = "插入一行" ;
this .button3.UseVisualStyleBackColor = true ;
this .button3.Click += new System.EventHandler( this .button3_Click);
//
// dataGridView1
//
this .dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this .dataGridView1.Location = new System.Drawing.Point(18, 20);
this .dataGridView1.Name = "dataGridView1" ;
this .dataGridView1.RowTemplate.Height = 23;
this .dataGridView1.Size = new System.Drawing.Size(516, 96);
this .dataGridView1.TabIndex = 0;
//
// groupBox5
//
this .groupBox5.Controls.Add( this .button4);
this .groupBox5.Controls.Add( this .dataGridView2);
this .groupBox5.Location = new System.Drawing.Point(12, 281);
this .groupBox5.Name = "groupBox5" ;
this .groupBox5.Size = new System.Drawing.Size(568, 162);
this .groupBox5.TabIndex = 6;
this .groupBox5.TabStop = false ;
this .groupBox5.Text = "方式五" ;
//
// button4
//
this .button4.Location = new System.Drawing.Point(377, 127);
this .button4.Name = "button4" ;
this .button4.Size = new System.Drawing.Size(157, 23);
this .button4.TabIndex = 4;
this .button4.Text = "插入一行" ;
this .button4.UseVisualStyleBackColor = true ;
this .button4.Click += new System.EventHandler( this .button4_Click);
//
// dataGridView2
//
this .dataGridView2.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this .dataGridView2.Location = new System.Drawing.Point(18, 20);
this .dataGridView2.Name = "dataGridView2" ;
this .dataGridView2.RowTemplate.Height = 23;
this .dataGridView2.Size = new System.Drawing.Size(516, 91);
this .dataGridView2.TabIndex = 0;
//
// textBox1
//
this .textBox1.Location = new System.Drawing.Point(18, 20);
this .textBox1.Name = "textBox1" ;
this .textBox1.Size = new System.Drawing.Size(157, 21);
this .textBox1.TabIndex = 0;
//
// trackBar1
//
this .trackBar1.Location = new System.Drawing.Point(18, 47);
this .trackBar1.Name = "trackBar1" ;
this .trackBar1.Size = new System.Drawing.Size(157, 45);
this .trackBar1.TabIndex = 1;
//
// Form2
//
this .AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this .AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this .ClientSize = new System.Drawing.Size(676, 471);
this .Controls.Add( this .groupBox5);
this .Controls.Add( this .groupBox4);
this .Controls.Add( this .groupBox3);
this .Controls.Add( this .groupBox2);
this .Controls.Add( this .groupBox1);
this .Name = "Form2" ;
this .Text = "Form2" ;
this .Load += new System.EventHandler( this .mainFrm_Load);
this .groupBox1.ResumeLayout( false );
this .groupBox1.PerformLayout();
this .groupBox2.ResumeLayout( false );
this .groupBox2.PerformLayout();
this .groupBox3.ResumeLayout( false );
this .groupBox3.PerformLayout();
this .groupBox4.ResumeLayout( false );
((System.ComponentModel.ISupportInitialize)( this .dataGridView1)).EndInit();
this .groupBox5.ResumeLayout( false );
((System.ComponentModel.ISupportInitialize)( this .dataGridView2)).EndInit();
((System.ComponentModel.ISupportInitialize)( this .trackBar1)).EndInit();
this .ResumeLayout( false );
}
#endregion
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.GroupBox groupBox2;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.GroupBox groupBox3;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.TextBox textBox3;
private System.Windows.Forms.GroupBox groupBox4;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.DataGridView dataGridView1;
private System.Windows.Forms.GroupBox groupBox5;
private System.Windows.Forms.Button button4;
private System.Windows.Forms.DataGridView dataGridView2;
private System.Windows.Forms.TrackBar trackBar1;
private System.Windows.Forms.TextBox textBox1;
}
}
效果图：
希望本文所述对大家C#程序设计有所帮助。
dy("nrwz");
查看更多关于C#中DataBindings用法实例分析的详细内容...