首先我用datagridview绑定一个datatable,然后使用代码修改其中一项的值,但我取这项的当前值还是以前的值,也就是
dt.Rows[0]["column1", DataRowVersion.Original] 等于 dt.Rows[0]["column1", DataRowVersion.Current]。如果我取dt.Rows[0]["column1", DataRowVersion.Current]以前先点下datagridview,让datagridview获得焦点,就没有问题。不可能每次修改完值后,还点下datagridview,这个问题怎么解决?
后面是具体的代码
dt.Rows[0]["column1", DataRowVersion.Original] 等于 dt.Rows[0]["column1", DataRowVersion.Current]。如果我取dt.Rows[0]["column1", DataRowVersion.Current]以前先点下datagridview,让datagridview获得焦点,就没有问题。不可能每次修改完值后,还点下datagridview,这个问题怎么解决?
后面是具体的代码
解决方案 »
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using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{
private DataTable dt = new DataTable(); public Form1()
{
InitializeComponent();
dataGridView1.AutoGenerateColumns = false;
} private void Form1_Load(object sender, EventArgs e)
{
dt.Columns.Add("column1");
DataRow newRow = dt.NewRow();
newRow["column1"] = "a";
dt.Rows.Add(newRow);
dt.AcceptChanges(); dataGridView1.DataSource = dt;
} private void button1_Click(object sender, EventArgs e)
{
string oldValue = dt.Rows[0]["column1", DataRowVersion.Original].ToString();
string curValue = dt.Rows[0]["column1", DataRowVersion.Current].ToString(); MessageBox.Show(oldValue + " " + curValue);
//这里为什么老的、新的都是a
//如果先点下datagridview1,相当于让datagridview获得焦点,这样就可以获得新的值,为什么
} private void textBox1_TextChanged(object sender, EventArgs e)
{
dataGridView1.Rows[0].Cells["column1"].Value = textBox1.Text;
}
}
static class Program
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null; /// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源,为 true;否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
} #region Windows 窗体设计器生成的代码 /// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.dataGridView1 = new System.Windows.Forms.DataGridView();
this.Column1 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.button1 = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
this.SuspendLayout();
//
// dataGridView1
//
this.dataGridView1.AllowUserToAddRows = false;
this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
this.Column1});
this.dataGridView1.Location = new System.Drawing.Point(12, 12);
this.dataGridView1.Name = "dataGridView1";
this.dataGridView1.Size = new System.Drawing.Size(240, 150);
this.dataGridView1.TabIndex = 0;
//
// Column1
//
this.Column1.DataPropertyName = "column1";
this.Column1.HeaderText = "Column1";
this.Column1.Name = "Column1";
this.Column1.ReadOnly = true;
//
// button1
//
this.button1.Location = new System.Drawing.Point(12, 200);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(152, 200);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(100, 21);
this.textBox1.TabIndex = 2;
this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(367, 322);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.button1);
this.Controls.Add(this.dataGridView1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
this.ResumeLayout(false);
this.PerformLayout(); } #endregion private System.Windows.Forms.DataGridView dataGridView1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.DataGridViewTextBoxColumn Column1;
}
}
1.在dataGridView1.DataSource = dt;这句后面加上
textBox1.DataBindings.Add("Text", dt, "column1");
2.按钮单击事件改成
string oldValue = dt.Rows[0]["column1", DataRowVersion.Original].ToString();
string curValue = dt.Rows[0]["column1", DataRowVersion.Current].ToString();
string value = dt.Rows[0]["column1"].ToString();
MessageBox.Show(oldValue + " " + curValue + " " + value + " " + dt.Rows[0].RowState.ToString());为什么这里的curValue还是原值,value倒是我修改的值,而且rowstate是unchanged,是不是我绑定的方法有问题?
其实DataGridView绑定的是DataTable的DataView
Button 按下时,你可以通过下面的语句获得当前绑定的行:var row = BindingContext[dataGridView1.DataSource].Current as DataRowView;当你在TextBox修改值,然后按下Button,你会发现 row.IsEdit == true,
且DataGridView里的值未发生变化。它标明编辑还没有结束。你可以在Button按下时,调用:row.EndEdit();告诉DataGridView编辑结束了就OK。