C#中DataBindings用法實例剖析。本站提示廣大學習愛好者：（C#中DataBindings用法實例剖析）文章只能為提供參考，不一定能成為您想要的結果。以下是C#中DataBindings用法實例剖析正文
本文實例講述了C#中DataBindings用法。分享給年夜家供年夜家參考，詳細以下：
在C#操作數據庫進程中，針對普通的文本控件，好比TextBox，Label等，我們賦值直接應用相似TextBox.Text=****的方法來停止，這類方法從某種意義下去說切實其實是最輕便的方法，然則關於龐雜一些的空間，好比說DataGridView，這個時刻，綁定命據源我們普通應用DataGridView1.DataSource=****的方法來停止，假如數據源略微有更改，那末只須要從新挪用綁定一遍便可。可以說這類方法是單向的，也即從數據庫到UI，然則有無一種方法可以或許完成數據源轉變的時刻，不消從新綁定DataGridView就讓它可以或許主動刷新數據呢，固然，這裡要提到的就是DataBinding了。
代碼以下
Form2.cs代碼：
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(); //運用於第二種方法
public int Num { get; set; } //運用於第三種方法
public List<BlogNew> blogNews { get; set; } //運用於第四種方法
public BindingList<BlogNew> blogNewsRegardUI { get; set; } //運用於DataGridView界面UI更新
private void mainFrm_Load(object sender, EventArgs e)
{
#region 測試一
/************************************************
* 第一個值：要綁定到TextBox的甚麼處所
* 第二個值：數據源是甚麼
* 第三個值：應當取數據源的甚麼屬性
* 第四個值：能否開啟數據格局化
* 第五個值：在甚麼時刻啟用數據源綁定
* *********************************************/
textBox1.DataBindings.Add("Text", trackBar1, "Value", false, DataSourceUpdateMode.OnPropertyChanged);
#endregion
#region 測試二
/*********************************************
* 這個重要就是經由過程一個內部的類，當作數據源
* *********************************************/
mydatasource.Myvalue = "這是個測試";
textBox2.DataBindings.Add("Text", mydatasource, "Myvalue", false, DataSourceUpdateMode.OnPropertyChanged);
#endregion
#region 測試三
/*****************************************
*這個重要就是經由過程自己具有的屬性，當作數據源
****************************************/
Num = 5;
textBox3.DataBindings.Add("Text", this, "Num", false, DataSourceUpdateMode.OnPropertyChanged);
#endregion
/*
* 留意：下面的3個測試，轉變文本框中的值，數據源中對應的屬性值會轉變
* 然則，數據源的屬性值轉變了，文本框中的值不會轉變
*/
#region 測試四 ： List<T>
blogNews = new List<BlogNew>();
blogNews.Add(new BlogNew { BlogID = 1, BlogTitle = "人生若只如初見" });
blogNews.Add(new BlogNew { BlogID = 2, BlogTitle = "何事金風抽豐悲畫扇" });
blogNews.Add(new BlogNew { BlogID = 3, BlogTitle = "最愛好納蘭性德" });
dataGridView1.DataBindings.Add("DataSource", this, "blogNews", false, DataSourceUpdateMode.OnPropertyChanged);
#endregion
#region 測試五 ： BindingList<T>
blogNewsRegardUI = new BindingList<BlogNew>();
blogNewsRegardUI.Add(new BlogNew { BlogID = 11, BlogTitle = "僵臥孤村不自哀" });
blogNewsRegardUI.Add(new BlogNew { BlogID = 12, BlogTitle = "尚思為國戍輪台" });
blogNewsRegardUI.Add(new BlogNew { BlogID = 13, BlogTitle = "夜闌臥聽風吹雨" });
dataGridView2.DataBindings.Add("DataSource", this, "blogNewsRegardUI", false, DataSourceUpdateMode.OnPropertyChanged);
#endregion
}
private void button1_Click(object sender, EventArgs e)
{
//從這裡可以看出，轉變了TextBox2中的值，這裡的值也轉變了，緣由是由於類屬於援用類型
MessageBox.Show(mydatasource.Myvalue);
}
private void button2_Click(object sender, EventArgs e)
{
//從這裡可以看出，轉變了TextBox3中的值，這裡的值也轉變了，
//緣由是Num被當作了以後窗體的一個屬性(窗體自己就是一個類)，也屬於援用類型
MessageBox.Show(Num.ToString());
//this.Num = 10;
//MessageBox.Show(Num.ToString());
}
private void button3_Click(object sender, EventArgs e)
{
//在這裡向DataGridView中拔出一行
var data = dataGridView1.DataSource as List<BlogNew>;
data.Add(new BlogNew { BlogID = 4, BlogTitle = "取次花叢懶回想，半緣修道半緣君" });
foreach (BlogNew blogNew in dataGridView1.DataSource as List<BlogNew>)
{
/***********
* 當我們心拔出一條BlogID記載為4的數據的時刻，在界面上可以看出dataGridView1的dataSource曾經被更新，
* 然則界面上照舊顯示為BlogID為1,2,3三條數據，很奇異
* *********************/
MessageBox.Show(blogNew.BlogID + "--" + blogNew.BlogTitle);
}
}
private void button4_Click(object sender, EventArgs e)
{
/*這裡重要用來處理DataGridView1界面不更新的成績，其實緣由在於應用了List<BlogNew>,這裡我們采取BindList<BlogNew>
*經由過程測試，我們發明，只需數據源轉變，界面便可以主動的停止更新了，很是便利，不須要從新綁定
*/
var dataRegardUI = dataGridView2.DataSource as BindingList<BlogNew>;
dataRegardUI.Add(new BlogNew { BlogID = 20, BlogTitle = "竹外桃花三兩枝，春江水暖鴨先知" });
}
}
public class MyDataSource
{
public string Myvalue { get; set; }
}
public class BlogNew
{
public int BlogID { get; set; }
public string BlogTitle { get; set; }
}
}
Form2.Designer.cs代碼：
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 = "方法一";
//
// 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 = "方法二";
//
// 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 = "檢查已修正的數據源的值";
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 = "方法三";
//
// 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 = "檢查已修正的數據源的值";
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 = "方法四";
//
// 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 = "拔出一行";
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 = "方法五";
//
// 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 = "拔出一行";
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;
}
}
後果圖：
願望本文所述對年夜家C#法式設計有所贊助。
