在 winforms 的 tabControl 中隐藏选项卡 headers

Question

我试图在 tabControl 中隐藏选项卡 headers，就像它在 this link 中显示的那样，但我在设计器代码中遇到错误。一旦我改变了这两行，我得到了这个：

Severity Code Description Project File Line Message The designer cannot process unknown name 'SelectedIndex' at line 43. The code within the method 'InitializeComponent' is generated by the designer and should not be manually modified. Please remove any changes and try opening the designer again. c:\users\krzysztof\documents\visual studio 2015\Projects\DaneUzytkownika3\DaneUzytkownika3\TabController.Designer.cs 44

Severity Code Description Project File Line Error CS1061 'TabController' does not contain a definition for 'SelectedIndex' and no extension method 'SelectedIndex' accepting a first argument of type 'TabController' could be found (are you missing a using directive or an assembly reference?) DaneUzytkownika3 c:\users\krzysztof\documents\visual studio 2015\Projects\DaneUzytkownika3\DaneUzytkownika3\TabController.Designer.cs 43

表单设计者代码中的第43行是：

this.tabControl1.SelectedIndex = 0;

谁能告诉我，我该如何解决？

TablessTabControl.cs

namespace hiding
{
    class TablessTabControl : Form1
    {
        protected override void WndProc(ref Message m)
        {
            // Hide tabs by trapping the TCM_ADJUSTRECT message
            if (m.Msg == 0x1328 && !DesignMode)
                m.Result = (IntPtr)1;
            else
                base.WndProc(ref m);
        }
    }
}

Form1.Designer.cs

namespace hiding
{
    partial class Form1
    {
        /// <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.tabControl1 = new TablessTabControl();
            //this.tabControl1 = new System.Windows.Forms.TabControl();
            this.tabPage1 = new System.Windows.Forms.TabPage();
            this.tabPage2 = new System.Windows.Forms.TabPage();
            this.tabControl1.SuspendLayout();
            this.SuspendLayout();
            // 
            // tabControl1
            // 
            this.tabControl1.Controls.Add(this.tabPage1);
            this.tabControl1.Controls.Add(this.tabPage2);
            this.tabControl1.Location = new System.Drawing.Point(31, 12);
            this.tabControl1.Name = "tabControl1";
            this.tabControl1.SelectedIndex = 0;//line with the error
            this.tabControl1.Size = new System.Drawing.Size(200, 100);
            this.tabControl1.TabIndex = 0;
            // 
            // tabPage1
            // 
            this.tabPage1.Location = new System.Drawing.Point(4, 22);
            this.tabPage1.Name = "tabPage1";
            this.tabPage1.Padding = new System.Windows.Forms.Padding(3);
            this.tabPage1.Size = new System.Drawing.Size(192, 74);
            this.tabPage1.TabIndex = 0;
            this.tabPage1.Text = "tabPage1";
            this.tabPage1.UseVisualStyleBackColor = true;
            // 
            // tabPage2
            // 
            this.tabPage2.Location = new System.Drawing.Point(4, 22);
            this.tabPage2.Name = "tabPage2";
            this.tabPage2.Padding = new System.Windows.Forms.Padding(3);
            this.tabPage2.Size = new System.Drawing.Size(192, 74);
            this.tabPage2.TabIndex = 1;
            this.tabPage2.Text = "tabPage2";
            this.tabPage2.UseVisualStyleBackColor = true;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 261);
            this.Controls.Add(this.tabControl1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.tabControl1.ResumeLayout(false);
            this.ResumeLayout(false);

        }

        #endregion

        private TablessTabControl tabControl1;
        //private System.Windows.Forms.TabControl tabControl1;
        private System.Windows.Forms.TabPage tabPage1;
        private System.Windows.Forms.TabPage tabPage2;
    }
}

Answer 1

我已经创建了一个项目并实现了您示例中给出的选项卡控件，如下所示：

class TablessTabControl : TabControl
{
    protected override void WndProc(ref Message m)
    {
        // Hide tabs by trapping the TCM_ADJUSTRECT message
        if (m.Msg == 0x1328 && !DesignMode)
            m.Result = (IntPtr)1;
        else
            base.WndProc(ref m);
    }
}

然后在重建项目后，我使用设计器将新的 TablessTabControl 添加到测试表单中。在设计器中，我可以使用可见的 headers.

在选项卡之间切换

在运行时，headers 按预期消失。我有两个标签；我可以使用以下代码在选项卡之间 select：

// Selects the first tab:
tablessTabControl1.SelectedIndex = 0;

// Selects the second tab:
tablessTabControl1.SelectedIndex = 1;

此外，在 Form1.Designer.cs 中，我有行 48 如下：

this.tablessTabControl1.SelectedIndex = 0;

这对我来说没有困难。

您是否尝试过关闭所有文档、清理解决方案、重建并重新打开设计器？

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