HelpProvider.SetHelpString(Control, String) 方法

参考

定义

命名空间:: System.Windows.Forms

程序集:: System.Windows.Forms.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

指定与指定的控件关联的帮助字符串。

public:
 virtual void SetHelpString(System::Windows::Forms::Control ^ ctl, System::String ^ helpString);

public virtual void SetHelpString (System.Windows.Forms.Control ctl, string helpString);

abstract member SetHelpString : System.Windows.Forms.Control * string -> unit
override this.SetHelpString : System.Windows.Forms.Control * string -> unit

Public Overridable Sub SetHelpString (ctl As Control, helpString As String)

参数

ctl: Control

与帮助字符串关联的 Control。

helpString: String

与控件关联的帮助字符串。

示例

下面的代码示例演示如何使用 HelpProvider 类在包含四个地址字段的窗体上显示上下文相关的帮助。此示例使用该方法 SetHelpString 设置帮助工具提示文本。使用上下文相关的“帮助”按钮并单击地址字段上的“帮助”光标时，“帮助工具提示”将显示指定文本。在地址字段中按具有焦点的 F1 键时，将显示 mspaint.chm 帮助文件，因为 HelpNamespace 属性已设置为 mspaint.chm。该方法 SetShowHelp 将为每个地址控件调用，以确定其具有可用帮助内容。

#using <System.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
public ref class Form1: public System::Windows::Forms::Form
{
private:
   System::Windows::Forms::TextBox^ addressTextBox;
   System::Windows::Forms::Label ^ label2;
   System::Windows::Forms::TextBox^ cityTextBox;
   System::Windows::Forms::Label ^ label3;
   System::Windows::Forms::TextBox^ stateTextBox;
   System::Windows::Forms::TextBox^ zipTextBox;
   System::Windows::Forms::HelpProvider^ helpProvider1;
   System::Windows::Forms::Label ^ helpLabel;

public:
   Form1()
   {
      this->addressTextBox = gcnew System::Windows::Forms::TextBox;
      this->helpLabel = gcnew System::Windows::Forms::Label;
      this->label2 = gcnew System::Windows::Forms::Label;
      this->cityTextBox = gcnew System::Windows::Forms::TextBox;
      this->label3 = gcnew System::Windows::Forms::Label;
      this->stateTextBox = gcnew System::Windows::Forms::TextBox;
      this->zipTextBox = gcnew System::Windows::Forms::TextBox;
      
      // Help Label
      this->helpLabel->BorderStyle = System::Windows::Forms::BorderStyle::Fixed3D;
      this->helpLabel->Location = System::Drawing::Point( 8, 80 );
      this->helpLabel->Size = System::Drawing::Size( 272, 72 );
      this->helpLabel->Text = "Click the Help button in the title bar, then click a control to see a Help tooltip for the control.  Click on a control and press F1 to invoke the Help system with a sample Help file.";
      
      // Address Label
      this->label2->Location = System::Drawing::Point( 16, 8 );
      this->label2->Size = System::Drawing::Size( 100, 16 );
      this->label2->Text = "Address:";
      
      // Comma Label
      this->label3->Location = System::Drawing::Point( 136, 56 );
      this->label3->Size = System::Drawing::Size( 16, 16 );
      this->label3->Text = ", ";
      
      // Create the HelpProvider.
      this->helpProvider1 = gcnew System::Windows::Forms::HelpProvider;
      
      // Tell the HelpProvider what controls to provide help for, and
      // what the help String* is.
      this->helpProvider1->SetShowHelp( this->addressTextBox, true );
      this->helpProvider1->SetHelpString( this->addressTextBox, "Enter the street address in this text box." );
      this->helpProvider1->SetShowHelp( this->cityTextBox, true );
      this->helpProvider1->SetHelpString( this->cityTextBox, "Enter the city here." );
      this->helpProvider1->SetShowHelp( this->stateTextBox, true );
      this->helpProvider1->SetHelpString( this->stateTextBox, "Enter the state in this text box." );
      this->helpProvider1->SetShowHelp( this->zipTextBox, true );
      this->helpProvider1->SetHelpString( this->zipTextBox, "Enter the zip code here." );
      
      // Set what the Help file will be for the HelpProvider.
      this->helpProvider1->HelpNamespace = "mspaint.chm";
      
      // Sets properties for the different address fields.
      // Address TextBox
      this->addressTextBox->Location = System::Drawing::Point( 16, 24 );
      this->addressTextBox->Size = System::Drawing::Size( 264, 20 );
      this->addressTextBox->TabIndex = 0;
      this->addressTextBox->Text = "";
      
      // City TextBox
      this->cityTextBox->Location = System::Drawing::Point( 16, 48 );
      this->cityTextBox->Size = System::Drawing::Size( 120, 20 );
      this->cityTextBox->TabIndex = 3;
      this->cityTextBox->Text = "";
      
      // State TextBox
      this->stateTextBox->Location = System::Drawing::Point( 152, 48 );
      this->stateTextBox->MaxLength = 2;
      this->stateTextBox->Size = System::Drawing::Size( 32, 20 );
      this->stateTextBox->TabIndex = 5;
      this->stateTextBox->Text = "";
      
      // Zip TextBox
      this->zipTextBox->Location = System::Drawing::Point( 192, 48 );
      this->zipTextBox->Size = System::Drawing::Size( 88, 20 );
      this->zipTextBox->TabIndex = 6;
      this->zipTextBox->Text = "";
      
      // Add the controls to the form.
      array<System::Windows::Forms::Control^>^temp0 = {this->zipTextBox,this->stateTextBox,this->label3,this->cityTextBox,this->label2,this->helpLabel,this->addressTextBox};
      this->Controls->AddRange( temp0 );
      
      // Set the form to look like a dialog, and show the HelpButton.
      this->FormBorderStyle = System::Windows::Forms::FormBorderStyle::FixedDialog;
      this->HelpButton = true;
      this->MaximizeBox = false;
      this->MinimizeBox = false;
      this->ClientSize = System::Drawing::Size( 292, 160 );
      this->Text = "Help Provider Demonstration";
   }

};


[STAThread]
int main()
{
   Application::Run( gcnew Form1 );
}

using System;
using System.Drawing;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
    private System.Windows.Forms.TextBox addressTextBox;
    private System.Windows.Forms.Label label2;
    private System.Windows.Forms.TextBox cityTextBox;
    private System.Windows.Forms.Label label3;
    private System.Windows.Forms.TextBox stateTextBox;
    private System.Windows.Forms.TextBox zipTextBox;
    private System.Windows.Forms.HelpProvider helpProvider1;
    private System.Windows.Forms.Label helpLabel;

    [STAThread]
    static void Main() 
    {
        Application.Run(new Form1());
    }

    public Form1()
    {
        this.addressTextBox = new System.Windows.Forms.TextBox();
        this.helpLabel = new System.Windows.Forms.Label();
        this.label2 = new System.Windows.Forms.Label();
        this.cityTextBox = new System.Windows.Forms.TextBox();
        this.label3 = new System.Windows.Forms.Label();
        this.stateTextBox = new System.Windows.Forms.TextBox();
        this.zipTextBox = new System.Windows.Forms.TextBox();
        
        // Help Label
        this.helpLabel.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.helpLabel.Location = new System.Drawing.Point(8, 80);
        this.helpLabel.Size = new System.Drawing.Size(272, 72);
        this.helpLabel.Text = "Click the Help button in the title bar, then click a control " + 
            "to see a Help tooltip for the control.  Click on a control and press F1 to invoke " +
            "the Help system with a sample Help file.";

        // Address Label
        this.label2.Location = new System.Drawing.Point(16, 8);
        this.label2.Size = new System.Drawing.Size(100, 16);
        this.label2.Text = "Address:";

        // Comma Label
        this.label3.Location = new System.Drawing.Point(136, 56);
        this.label3.Size = new System.Drawing.Size(16, 16);
        this.label3.Text = ",";

        // Create the HelpProvider.
        this.helpProvider1 = new System.Windows.Forms.HelpProvider();

        // Tell the HelpProvider what controls to provide help for, and
        // what the help string is.
        this.helpProvider1.SetShowHelp(this.addressTextBox, true);
        this.helpProvider1.SetHelpString(this.addressTextBox, "Enter the street address in this text box.");

        this.helpProvider1.SetShowHelp(this.cityTextBox, true);
        this.helpProvider1.SetHelpString(this.cityTextBox, "Enter the city here.");

        this.helpProvider1.SetShowHelp(this.stateTextBox, true);
        this.helpProvider1.SetHelpString(this.stateTextBox, "Enter the state in this text box.");

        this.helpProvider1.SetShowHelp(this.zipTextBox, true);
        this.helpProvider1.SetHelpString(this.zipTextBox, "Enter the zip code here.");

        // Set what the Help file will be for the HelpProvider.
        this.helpProvider1.HelpNamespace = "mspaint.chm";

        // Sets properties for the different address fields.

        // Address TextBox
        this.addressTextBox.Location = new System.Drawing.Point(16, 24);
        this.addressTextBox.Size = new System.Drawing.Size(264, 20);
        this.addressTextBox.TabIndex = 0;
        this.addressTextBox.Text = "";

        // City TextBox
        this.cityTextBox.Location = new System.Drawing.Point(16, 48);
        this.cityTextBox.Size = new System.Drawing.Size(120, 20);
        this.cityTextBox.TabIndex = 3;
        this.cityTextBox.Text = "";

        // State TextBox
        this.stateTextBox.Location = new System.Drawing.Point(152, 48);
        this.stateTextBox.MaxLength = 2;
        this.stateTextBox.Size = new System.Drawing.Size(32, 20);
        this.stateTextBox.TabIndex = 5;
        this.stateTextBox.Text = "";

        // Zip TextBox
        this.zipTextBox.Location = new System.Drawing.Point(192, 48);
        this.zipTextBox.Size = new System.Drawing.Size(88, 20);
        this.zipTextBox.TabIndex = 6;
        this.zipTextBox.Text = "";

        // Add the controls to the form.
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                    this.zipTextBox, this.stateTextBox,
                                    this.label3, this.cityTextBox,
                                    this.label2, this.helpLabel,
                                    this.addressTextBox});

        // Set the form to look like a dialog, and show the HelpButton.    
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
        this.HelpButton = true;
        this.MaximizeBox = false;
        this.MinimizeBox = false;
        this.ClientSize = new System.Drawing.Size(292, 160);
        this.Text = "Help Provider Demonstration";
    }
}

Imports System.Drawing
Imports System.Windows.Forms

Public Class Form1
    Inherits System.Windows.Forms.Form
    Private addressTextBox As System.Windows.Forms.TextBox
    Private label2 As System.Windows.Forms.Label
    Private cityTextBox As System.Windows.Forms.TextBox
    Private label3 As System.Windows.Forms.Label
    Private stateTextBox As System.Windows.Forms.TextBox
    Private zipTextBox As System.Windows.Forms.TextBox
    Private helpProvider1 As System.Windows.Forms.HelpProvider
    Private helpLabel As System.Windows.Forms.Label

    <STAThread()>  _
    Shared Sub Main()
        Application.Run(New Form1())
    End Sub
    
    Public Sub New()
        Me.addressTextBox = New System.Windows.Forms.TextBox()
        Me.helpLabel = New System.Windows.Forms.Label()
        Me.label2 = New System.Windows.Forms.Label()
        Me.cityTextBox = New System.Windows.Forms.TextBox()
        Me.label3 = New System.Windows.Forms.Label()
        Me.stateTextBox = New System.Windows.Forms.TextBox()
        Me.zipTextBox = New System.Windows.Forms.TextBox()

        ' Help Label
        Me.helpLabel.Location = New System.Drawing.Point(8, 80)
        Me.helpLabel.Size = New System.Drawing.Size(272, 72)
        Me.helpLabel.TabIndex = 1
        Me.helpLabel.Text = "Click the Help button in the title bar, then click a control " & _
            "to see a Help tooltip for the control.  Click on a control and press F1 to invoke " & _
            "the Help system with a sample Help file."

        ' Address Label
        Me.label2.Location = New System.Drawing.Point(16, 8)
        Me.label2.Size = New System.Drawing.Size(100, 16)
        Me.label2.Text = "Address:"

        ' Comma Label
        Me.label3.Location = New System.Drawing.Point(136, 56)
        Me.label3.Size = New System.Drawing.Size(16, 16)
        Me.label3.Text = ","

        ' Creates the HelpProvider.
        Me.helpProvider1 = New System.Windows.Forms.HelpProvider()

        ' Tell the HelpProvider what controls to provide Help for, and
        ' what the Help string is.
        Me.helpProvider1.SetHelpString(Me.addressTextBox, "Enter the street address in this text box.")
        Me.helpProvider1.SetShowHelp(Me.addressTextBox, True)

        Me.helpProvider1.SetHelpString(Me.cityTextBox, "Enter the city here.")
        Me.helpProvider1.SetShowHelp(Me.cityTextBox, True)

        Me.helpProvider1.SetHelpString(Me.stateTextBox, "Enter the state in this text box.")
        Me.helpProvider1.SetShowHelp(Me.stateTextBox, True)

        Me.helpProvider1.SetHelpString(Me.zipTextBox, "Enter the zip code here.")
        Me.helpProvider1.SetShowHelp(Me.zipTextBox, True)

        ' Sets what the Help file will be for the HelpProvider.
        Me.helpProvider1.HelpNamespace = "mspaint.chm"

        ' Set properties for the different address fields.

        ' Address TextBox
        Me.addressTextBox.Location = New System.Drawing.Point(16, 24)
        Me.addressTextBox.Size = New System.Drawing.Size(264, 20)
        Me.addressTextBox.TabIndex = 0
        Me.addressTextBox.Text = ""


        ' City TextBox
        Me.cityTextBox.Location = New System.Drawing.Point(16, 48)
        Me.cityTextBox.Size = New System.Drawing.Size(120, 20)
        Me.cityTextBox.TabIndex = 3
        Me.cityTextBox.Text = ""

        ' State TextBox
        Me.stateTextBox.Location = New System.Drawing.Point(152, 48)
        Me.stateTextBox.MaxLength = 2
        Me.stateTextBox.Size = New System.Drawing.Size(32, 20)
        Me.stateTextBox.TabIndex = 5
        Me.stateTextBox.Text = ""

        ' Zip TextBox
        Me.zipTextBox.Location = New System.Drawing.Point(192, 48)
        Me.zipTextBox.Size = New System.Drawing.Size(88, 20)
        Me.zipTextBox.TabIndex = 6
        Me.zipTextBox.Text = ""

        ' Add the controls to the form.
        Me.Controls.AddRange(New System.Windows.Forms.Control() { Me.zipTextBox, _
                                       Me.stateTextBox, Me.label3, _
                                       Me.cityTextBox, Me.label2, _
                                       Me.helpLabel, Me.addressTextBox})

        ' Set the form to look like a dialog, and show the HelpButton.    
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog
        Me.HelpButton = True
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.ClientSize = New System.Drawing.Size(292, 160)
        Me.Text = "Help Provider Demonstration"

    End Sub
End Class

注解

当用户按下 F1 键时，在指定控件具有焦点时，将在参数中指定的 helpString 帮助字符串显示在弹出窗口中。

适用于

通过

HelpProvider.SetHelpString(Control, String) 方法

定义

参数

示例

注解

适用于

另请参阅

其他资源