请教Button的属性 CausesValidation ？

Question

CausesValidation 
MS：指示次组件是否触发验证事件。
CS有验证控件么？  请教 请教..

Answer 1

CS什么意思？
Winform?由于winform程序无需与服务器往返，验证什么可以直接验证了，无需验证控件了

Answer 2

CausesValidation 属性规定当按钮控件被点击时是否验证页面。当按钮被点击时，页面验证默认为执行。

Answer 3

晕 ， 这是Winform程序呀，

Answer 4

在B/S中，asp.net中存在验证控件，表示的意思：单击按钮时，是否触发验证。但是在默认情况下都是触发的，一般不需要特别设置。只是如果存在多个按钮的情况下，才会有用。

Answer 5

C/S架构当没有自带的验证控件，验证逻辑都要自己写
这个属性的作用只是用作是一个开启是否验证某种逻辑的开关。没有通过就则焦点停留在控件。
给你一个相应的源代码，你可以看一下：
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 Test
{
    public partial class Form1 : Form
    {
        /// <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.myLabel = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.myTextBox1 = new System.Windows.Forms.TextBox();
            this.myTextBox2 = new System.Windows.Forms.TextBox();
            this.myButtonAdd = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // myLabel
            // 
            this.myLabel.AutoSize = true;
            this.myLabel.Location = new System.Drawing.Point(70, 107);
            this.myLabel.Name = "myLabel";
            this.myLabel.Size = new System.Drawing.Size(71, 12);
            this.myLabel.TabIndex = 0;
            this.myLabel.Text = "Description";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(71, 136);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = "Enabled";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // myTextBox1
            // 
            this.myTextBox1.Location = new System.Drawing.Point(72, 24);
            this.myTextBox1.Name = "myTextBox1";
            this.myTextBox1.Size = new System.Drawing.Size(220, 21);
            this.myTextBox1.TabIndex = 2;
            // 
            // myTextBox2
            // 
            this.myTextBox2.Location = new System.Drawing.Point(72, 69);
            this.myTextBox2.Name = "myTextBox2";
            this.myTextBox2.Size = new System.Drawing.Size(220, 21);
            this.myTextBox2.TabIndex = 2;
            // 
            // myButtonAdd
            // 
            this.myButtonAdd.Location = new System.Drawing.Point(152, 136);
            this.myButtonAdd.Name = "myButtonAdd";
            this.myButtonAdd.Size = new System.Drawing.Size(90, 23);
            this.myButtonAdd.TabIndex = 1;
            this.myButtonAdd.Text = "AddTwoValue";
            this.myButtonAdd.UseVisualStyleBackColor = true;
            this.myButtonAdd.Click += new System.EventHandler(this.myButtonAdd_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(25, 28);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(41, 12);
            this.label1.TabIndex = 0;
            this.label1.Text = "Value1";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(25, 73);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(41, 12);
            this.label2.TabIndex = 0;
            this.label2.Text = "Value2";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(329, 199);
            this.Controls.Add(this.myTextBox2);
            this.Controls.Add(this.myTextBox1);
            this.Controls.Add(this.myButtonAdd);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.myLabel);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
            this.PerformLayout();        }        #endregion        private System.Windows.Forms.Label myLabel;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox myTextBox1;
        private System.Windows.Forms.TextBox myTextBox2;
        private Label label1;
        private Label label2;
        private System.Windows.Forms.Button myButtonAdd;        public Form1()
        {
            InitializeComponent();
            AddHandlers();
        }
        private void AddHandlers()
        {
            // Add the Validating and Validated handlers for textboxes.
            myTextBox1.Validating += new System.ComponentModel.CancelEventHandler(myTextBox1_Validating);
            myTextBox1.Validated += new System.EventHandler(myTextBox1_Validated);
            myTextBox1.CausesValidationChanged += new System.EventHandler(myTextBox1_CausesValidationChanged);            myTextBox2.Validating += new System.ComponentModel.CancelEventHandler(myTextBox2_Validating);
            myTextBox2.Validated += new System.EventHandler(myTextBox2_Validated);
            myTextBox2.CausesValidationChanged += new System.EventHandler(myTextBox2_CausesValidationChanged);
            
            if (myTextBox1.CausesValidation == true && myTextBox2.CausesValidation == true)
            {
                button1.Text = "Disable Validation";
                myLabel.Text = "Validation Enabled";
                this.Focus();
            }
        }        private void myTextBox1_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            if (!CheckIfTextBoxNumeric(myTextBox1))
            {
                myLabel.Text = "Has to be numeric";
                e.Cancel = true;
            }
        }
        private void myTextBox1_Validated(object sender, System.EventArgs e)
        {
            myLabel.Text = "Validated first control";
        }        private void myTextBox1_CausesValidationChanged(object sender, System.EventArgs e)
        {
            myLabel.Text = "CausesValidation property was changed for First Textbox";
        }
        
        private void myTextBox2_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            if (!CheckIfTextBoxNumeric(myTextBox2))
            {
                myLabel.Text = "Has to be numeric";
                e.Cancel = true;
            }
        }        private void myTextBox2_Validated(object sender, System.EventArgs e)
        {
            myLabel.Text = "Validated second control";
        }        private void myTextBox2_CausesValidationChanged(object sender, System.EventArgs e)
        {
            myLabel.Text = "CausesValidation property was changed for Second Textbox";
        }        private bool CheckIfTextBoxNumeric(TextBox myTextBox1)
        {
            bool isValid = true;
            if (myTextBox1.Text == "")
            {
                isValid = false;
            }
            else
            {
                for (int i = 0; i < myTextBox1.Text.Length; i++)
                {
                    if (!(System.Char.IsNumber(myTextBox1.Text[i])))
                    {
                        myTextBox1.Text = "";
                        isValid = false;
                        break;
                    }
                }
            }
            return isValid;
        }
        private void myButtonAdd_Click(object sender, System.EventArgs e)
        {
            try
            {
                int result = Convert.ToInt32(myTextBox1.Text) + Convert.ToInt32(myTextBox2.Text);
                myLabel.Text = result.ToString();
            }
            catch (Exception myException)
            {
                myLabel.Text = "Exception : " + myException.Message;
            }
        }
        private void button1_Click(object sender, System.EventArgs e)
        {
            if (myTextBox1.CausesValidation == false && myTextBox2.CausesValidation == false)
            {
                myTextBox1.CausesValidation = true;
                myTextBox2.CausesValidation = true;
                button1.Text = "Disable Validation";
                myLabel.Text = "Validation Enabled";
            }
            else if (myTextBox1.CausesValidation == true && myTextBox2.CausesValidation == true)
            {
                myTextBox1.CausesValidation = false;
                myTextBox2.CausesValidation = false;
                button1.Text = "Enable Validation";
                myLabel.Text = "Validation Disabled";
            }
        }
    }
}