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我試圖讓應用程序導航到Web瀏覽器組件中的某個URL，一旦ENTER鍵被按下（條形碼閱讀器將數據輸入到條形碼文本框並編程爲添加每次掃描結束時按「ENTER」）。然後條形碼號碼通過URL發送到服務器進行驗證，結果顯示在Web瀏覽器中。C＃Keydown事件不起作用
在閱讀Stack Overflow之後，我得出結論：this.KeyPreview尚未設置 - 但是，即使設置爲True，它仍然不會。
我希望它做的是當在Form2上的任何地方按下ENTER時，它應該將WebBrowser組件URL更改爲Barcode文本框中包含的數據。
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 SUBWAY_deliverX_2017_POSlink
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
this.ActiveControl = Barcode;
}
private void Form2_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
Close();
}
private void button2_Click(object sender, EventArgs e)
{
}
private void Barcode_TextChanged(object sender, EventArgs e)
{
}
private void Barcode_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
webBrowser1.Navigate("https://10.0.0.142/deliverXPOSquery.php?barcode=" + Barcode.Text);
}
}
}
}
而且設計文件：
namespace SUBWAY_deliverX_2017_POSlink
{
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()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form2));
this.button1 = new System.Windows.Forms.Button();
this.Barcode = new System.Windows.Forms.TextBox();
this.pictureBox1 = new System.Windows.Forms.PictureBox();
this.webBrowser1 = new System.Windows.Forms.WebBrowser();
this.button2 = new System.Windows.Forms.Button();
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
this.SuspendLayout();
//
// button1
//
this.button1.Font = new System.Drawing.Font("Microsoft Sans Serif", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.button1.Location = new System.Drawing.Point(177, 241);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(249, 79);
this.button1.TabIndex = 0;
this.button1.Text = "Return to SubShop";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Barcode
//
this.Barcode.BackColor = System.Drawing.SystemColors.Control;
this.Barcode.BorderStyle = System.Windows.Forms.BorderStyle.None;
this.Barcode.Font = new System.Drawing.Font("Microsoft Sans Serif", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.Barcode.Location = new System.Drawing.Point(178, 323);
this.Barcode.Name = "Barcode";
this.Barcode.Size = new System.Drawing.Size(249, 24);
this.Barcode.TabIndex = 1;
this.Barcode.TextChanged += new System.EventHandler(this.Barcode_TextChanged);
//
// pictureBox1
//
this.pictureBox1.Image = global::SUBWAY_deliverX_2017_POSlink.Properties.Resources.delxstoreheader;
this.pictureBox1.Location = new System.Drawing.Point(0, -2);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(589, 102);
this.pictureBox1.TabIndex = 3;
this.pictureBox1.TabStop = false;
//
// webBrowser1
//
this.webBrowser1.Location = new System.Drawing.Point(12, 106);
this.webBrowser1.MinimumSize = new System.Drawing.Size(20, 20);
this.webBrowser1.Name = "webBrowser1";
this.webBrowser1.Size = new System.Drawing.Size(563, 120);
this.webBrowser1.TabIndex = 4;
this.webBrowser1.Url = new System.Uri("https://10.0.0.142/deliverXPOSquery.php", System.UriKind.Absolute);
//
// button2
//
this.button2.Location = new System.Drawing.Point(471, 256);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(75, 23);
this.button2.TabIndex = 5;
this.button2.Text = "button2";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// Form2
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(587, 346);
this.ControlBox = false;
this.KeyPreview = true;
this.Controls.Add(this.button2);
this.Controls.Add(this.webBrowser1);
this.Controls.Add(this.pictureBox1);
this.Controls.Add(this.Barcode);
this.Controls.Add(this.button1);
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.MaximumSize = new System.Drawing.Size(603, 385);
this.MinimumSize = new System.Drawing.Size(603, 385);
this.Name = "Form2";
this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "deliverX 2017 - Order Validation";
this.TopMost = true;
this.Load += new System.EventHandler(this.Form2_Load);
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox Barcode;
private System.Windows.Forms.PictureBox pictureBox1;
private System.Windows.Forms.WebBrowser webBrowser1;
private System.Windows.Forms.Button button2;
}
}
您應該只包含重現問題所需的最短代碼。不要在此發佈所有程序。請參閱：[如何創建最小，完整和可驗證示例]（http://stackoverflow.com/help/mcve）。請從問題 –