RichTextBox.LoadFile RichTextBox.LoadFile RichTextBox.LoadFile RichTextBox.LoadFile Method

定义

将文件的内容加载到 RichTextBox 控件中。Loads the contents of a file into the RichTextBox control.

重载

LoadFile(String) LoadFile(String) LoadFile(String) LoadFile(String)

将 RTF 格式文件或标准 ASCII 文本文件加载到 RichTextBox 控件中。Loads a rich text format (RTF) or standard ASCII text file into the RichTextBox control.

LoadFile(Stream, RichTextBoxStreamType) LoadFile(Stream, RichTextBoxStreamType) LoadFile(Stream, RichTextBoxStreamType) LoadFile(Stream, RichTextBoxStreamType)

将现有数据流的内容加载到 RichTextBox 控件中。Loads the contents of an existing data stream into the RichTextBox control.

LoadFile(String, RichTextBoxStreamType) LoadFile(String, RichTextBoxStreamType) LoadFile(String, RichTextBoxStreamType) LoadFile(String, RichTextBoxStreamType)

将特定类型的文件加载到 RichTextBox 控件中。Loads a specific type of file into the RichTextBox control.

LoadFile(String) LoadFile(String) LoadFile(String) LoadFile(String)

将 RTF 格式文件或标准 ASCII 文本文件加载到 RichTextBox 控件中。Loads a rich text format (RTF) or standard ASCII text file into the RichTextBox control.

public:
 void LoadFile(System::String ^ path);
public void LoadFile (string path);
member this.LoadFile : string -> unit
Public Sub LoadFile (path As String)

参数

path
String String String String

要加载到控件中的文件的名称和位置。The name and location of the file to load into the control.

异常

将文件加载到控件中时出现错误。An error occurred while loading the file into the control.

所加载的文件不是 RTF 文档。The file being loaded is not an RTF document.

示例

下面的代码示例在RichTextBox控件中打开一个 RTF 文件。The following code example opens an RTF file into the RichTextBox control. 该示例使用OpenFileDialog类来显示一个对话框,以便向用户请求该文件。The example uses the OpenFileDialog class to display a dialog to request the file from the user. 然后,代码会加载该文件(假定它是一个 RTF 文档文件)。The code then loads that file assuming that it is an RTF document file. 如果文件不是,则示例代码将引发异常。If the file is not, the example code will throw an exception. 此示例要求将代码放置在一个Form RichTextBox具有名为richTextBox1的控件的类中。This example requires that the code is placed in a Form class that has a RichTextBox control named richTextBox1.

public:
   void LoadMyFile()
   {
      // Create an OpenFileDialog to request a file to open.
      OpenFileDialog^ openFile1 = gcnew OpenFileDialog;
      
      // Initialize the OpenFileDialog to look for RTF files.
      openFile1->DefaultExt = "*.rtf";
      openFile1->Filter = "RTF Files|*.rtf";
      
      // Determine whether the user selected a file from the OpenFileDialog.
      if ( openFile1->ShowDialog() == System::Windows::Forms::DialogResult::OK &&
         openFile1->FileName->Length > 0 )
      {
         // Load the contents of the file into the RichTextBox.
         richTextBox1->LoadFile( openFile1->FileName );
      }
   }
public void LoadMyFile()
{
   // Create an OpenFileDialog to request a file to open.
   OpenFileDialog openFile1 = new OpenFileDialog();

   // Initialize the OpenFileDialog to look for RTF files.
   openFile1.DefaultExt = "*.rtf";
   openFile1.Filter = "RTF Files|*.rtf";

   // Determine whether the user selected a file from the OpenFileDialog.
   if(openFile1.ShowDialog() == System.Windows.Forms.DialogResult.OK &&
      openFile1.FileName.Length > 0) 
   {
      // Load the contents of the file into the RichTextBox.
      richTextBox1.LoadFile(openFile1.FileName);
   }
}

Public Sub LoadMyFile()
    ' Create an OpenFileDialog to request a file to open.
    Dim openFile1 As New OpenFileDialog()
    
    ' Initialize the OpenFileDialog to look for RTF files.
    openFile1.DefaultExt = "*.rtf"
    openFile1.Filter = "RTF Files|*.rtf"
    
    ' Determine whether the user selected a file from the OpenFileDialog.
    If (openFile1.ShowDialog() = System.Windows.Forms.DialogResult.OK) _
        And (openFile1.FileName.Length > 0) Then
        
        ' Load the contents of the file into the RichTextBox.
        richTextBox1.LoadFile(openFile1.FileName)
    End If
End Sub

注解

使用LoadFile方法加载文件时,要加载的文件的内容将替换RichTextBox控件的全部内容。When loading a file with the LoadFile method, the contents of the file being loaded replace the entire contents of the RichTextBox control. 这将导致TextRtf属性的值发生更改。This will cause the values of the Text and Rtf properties to change. 您可以使用此方法将以前创建的文本或 RTF 文档加载到控件中进行操作。You can use this method to load a previously created text or RTF document into the control for manipulation. 如果要保存该文件,可以使用SaveFile方法。If you want to save the file, you can use the SaveFile method.

备注

使用此版本的LoadFile方法时,如果加载的文件不是 RTF 文档,则会出现异常。With this version of the LoadFile method, if the file being loaded is not an RTF document, an exception will occur. 若要加载不同类型的文件(如 ASCII 文本文件),请使用此方法的其他版本,该方法接受RichTextBoxStreamType枚举中的值作为参数。To load a different type of file such as an ASCII text file, use the other versions of this method that accept a value from the RichTextBoxStreamType enumeration as a parameter.

备注

LoadFile为创建RichTextBox句柄之前,方法将不会打开文件。The LoadFile method will not open a file until a handle is created for the RichTextBox. 确保在调用LoadFile方法之前创建控件的句柄。Ensure that the control's handle is created before calling the LoadFile method.

安全性

FileIOPermission
用于打开文件。for opening a file. 关联的枚举:ReadFileIOPermissionAccess值。Associated enumeration: The Read value of FileIOPermissionAccess.

另请参阅

LoadFile(Stream, RichTextBoxStreamType) LoadFile(Stream, RichTextBoxStreamType) LoadFile(Stream, RichTextBoxStreamType) LoadFile(Stream, RichTextBoxStreamType)

将现有数据流的内容加载到 RichTextBox 控件中。Loads the contents of an existing data stream into the RichTextBox control.

public:
 void LoadFile(System::IO::Stream ^ data, System::Windows::Forms::RichTextBoxStreamType fileType);
public void LoadFile (System.IO.Stream data, System.Windows.Forms.RichTextBoxStreamType fileType);
member this.LoadFile : System.IO.Stream * System.Windows.Forms.RichTextBoxStreamType -> unit
Public Sub LoadFile (data As Stream, fileType As RichTextBoxStreamType)

参数

data
Stream Stream Stream Stream

要加载到 RichTextBox 控件中的数据流。A stream of data to load into the RichTextBox control.

异常

将文件加载到控件中时出现错误。An error occurred while loading the file into the control.

所加载的文件不是 RTF 文档。The file being loaded is not an RTF document.

示例

下面的代码示例演示如何将SaveFileLoadFile方法与流一起使用。The following code example demonstrates using the SaveFile and LoadFile methods with streams. 它还演示了如何FileDialog.FileName使用FileDialog.DefaultExtSaveFileDialog.CreatePrompt、和SaveFileDialog.OverwritePrompt成员。It also demonstrates using the FileDialog.FileName, FileDialog.DefaultExt, SaveFileDialog.CreatePrompt, and SaveFileDialog.OverwritePrompt members.

这是一个完整的示例,可以在将其复制到项目时运行。This is a complete example that is ready to run when you copy it to your project.

using namespace System;
using namespace System::Drawing;
using namespace System::IO;
using namespace System::Windows::Forms;

public ref class Form1: public Form
{
public private:
   RichTextBox^ RichTextBox1;
   Button^ Button1;
   RichTextBox^ RichTextBox2;
   Button^ Button2;
   SaveFileDialog^ SaveFileDialog1;

public:
   Form1()
      : Form()
   {
      userInput = gcnew MemoryStream;
      this->RichTextBox1 = gcnew RichTextBox;
      this->Button1 = gcnew Button;
      this->RichTextBox2 = gcnew RichTextBox;
      this->Button2 = gcnew Button;
      this->SaveFileDialog1 = gcnew SaveFileDialog;
      this->SuspendLayout();
      this->RichTextBox1->Location = Point( 24, 64 );
      this->RichTextBox1->Name = "RichTextBox1";
      this->RichTextBox1->TabIndex = 0;
      this->RichTextBox1->Text = "Type something here.";
      this->Button1->Location = Point( 96, 16 );
      this->Button1->Name = "Button1";
      this->Button1->Size = Size( 96, 24 );
      this->Button1->TabIndex = 1;
      this->Button1->Text = "Save To Stream";
      this->Button1->Click += 
          gcnew EventHandler( this, &Form1::Button1_Click );
      this->RichTextBox2->Location = Point( 152, 64 );
      this->RichTextBox2->Name = "RichTextBox2";
      this->RichTextBox2->TabIndex = 3;
      this->RichTextBox2->Text = "It will be added to the stream "
      "and appear here.";
      this->Button2->Location = Point( 104, 200 );
      this->Button2->Name = "Button2";
      this->Button2->Size = Size( 88, 32 );
      this->Button2->TabIndex = 4;
      this->Button2->Text = "Save Stream To File";
      this->Button2->Click += 
          gcnew EventHandler( this, &Form1::Button2_Click );
      this->ClientSize = Size( 292, 266 );
      this->Controls->Add( this->Button2 );
      this->Controls->Add( this->RichTextBox2 );
      this->Controls->Add( this->Button1 );
      this->Controls->Add( this->RichTextBox1 );
      this->Name = "Form1";
      this->Text = "Form1";
      this->ResumeLayout( false );
   }

   // Declare a new memory stream.
   MemoryStream^ userInput;

private:

   // Save the content of RichTextBox1 to the memory stream, 
   // appending a LineFeed character.  
   void Button1_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      RichTextBox1->SaveFile( userInput, RichTextBoxStreamType::PlainText );
      userInput->WriteByte( 13 );
      
      // Display the entire contents of the stream,
      // by setting its position to 0, to RichTextBox2.
      userInput->Position = 0;
      RichTextBox2->LoadFile( userInput, RichTextBoxStreamType::PlainText );
   }


   // Shows the use of a SaveFileDialog to save a MemoryStream to a file.
   void Button2_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      
      // Set the properties on SaveFileDialog1 so the user is 
      // prompted to create the file if it doesn't exist 
      // or overwrite the file if it does exist.
      SaveFileDialog1->CreatePrompt = true;
      SaveFileDialog1->OverwritePrompt = true;
      
      // Set the file name to myText.txt, set the type filter
      // to text files, and set the initial directory to the
      // MyDocuments folder.
      SaveFileDialog1->FileName = "myText";
      // DefaultExt is only used when "All files" is selected from 
      // the filter box and no extension is specified by the user.
      SaveFileDialog1->DefaultExt = "txt";
      SaveFileDialog1->Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
      SaveFileDialog1->InitialDirectory = 
          Environment->GetFolderPath(Environment::SpecialFolder::MyDocuments);
      
      // Call ShowDialog and check for a return value of DialogResult.OK,
      // which indicates that the file was saved. 
      DialogResult result = SaveFileDialog1->ShowDialog();
      Stream^ fileStream;
      if ( result == DialogResult::OK )
      {
         fileStream = SaveFileDialog1->OpenFile();
         userInput->Position = 0;
         userInput->WriteTo( fileStream );
         fileStream->Close();
      }
   }
};

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

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

public partial class Form1: Form
{
    internal RichTextBox RichTextBox1;
    internal Button Button1;
    internal RichTextBox RichTextBox2;
    internal Button Button2;
    internal SaveFileDialog SaveFileDialog1;

    public Form1() : base()
    {   
        this.RichTextBox1 = new RichTextBox();
        this.Button1 = new Button();
        this.RichTextBox2 = new RichTextBox();
        this.Button2 = new Button();
        this.SaveFileDialog1 = new SaveFileDialog();
        this.SuspendLayout();
        this.RichTextBox1.Location = new Point(24, 64);
        this.RichTextBox1.Name = "RichTextBox1";
        this.RichTextBox1.TabIndex = 0;
        this.RichTextBox1.Text = "Type something here.";
        this.Button1.Location = new Point(96, 16);
        this.Button1.Name = "Button1";
        this.Button1.Size = new Size(96, 24);
        this.Button1.TabIndex = 1;
        this.Button1.Text = "Save To Stream";
        this.Button1.Click += new EventHandler(Button1_Click);
        this.RichTextBox2.Location = new Point(152, 64);
        this.RichTextBox2.Name = "RichTextBox2";
        this.RichTextBox2.TabIndex = 3;
        this.RichTextBox2.Text = 
            "It will be added to the stream and appear here.";
        this.Button2.Location = new Point(104, 200);
        this.Button2.Name = "Button2";
        this.Button2.Size = new Size(88, 32);
        this.Button2.TabIndex = 4;
        this.Button2.Text = "Save Stream To File";
        this.Button2.Click += new EventHandler(Button2_Click);
        this.ClientSize = new Size(292, 266);
        this.Controls.Add(this.Button2);
        this.Controls.Add(this.RichTextBox2);
        this.Controls.Add(this.Button1);
        this.Controls.Add(this.RichTextBox1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.ResumeLayout(false);
    }

    public static void Main()
    {
        Application.Run(new Form1());
    }

    // Declare a new memory stream.
    MemoryStream userInput = new MemoryStream();

    // Save the content of RichTextBox1 to the memory stream, 
    // appending a LineFeed character.  
    private void Button1_Click(Object sender, EventArgs e)
    {
        RichTextBox1.SaveFile(userInput, RichTextBoxStreamType.PlainText);
        userInput.WriteByte(13);

        // Display the entire contents of the stream,
        // by setting its position to 0, to RichTextBox2.
        userInput.Position = 0;
        RichTextBox2.LoadFile(userInput, RichTextBoxStreamType.PlainText);
    }

    // Shows the use of a SaveFileDialog to save a MemoryStream to a file.
    private void Button2_Click(Object sender, EventArgs e)
    {
        // Set the properties on SaveFileDialog1 so the user is 
        // prompted to create the file if it doesn't exist 
        // or overwrite the file if it does exist.
        SaveFileDialog1.CreatePrompt = true;
        SaveFileDialog1.OverwritePrompt = true;

        // Set the file name to myText.txt, set the type filter
        // to text files, and set the initial directory to the 
        // MyDocuments folder.
        SaveFileDialog1.FileName = "myText";
        // DefaultExt is only used when "All files" is selected from 
        // the filter box and no extension is specified by the user.
        SaveFileDialog1.DefaultExt = "txt";
        SaveFileDialog1.Filter = 
            "Text files (*.txt)|*.txt|All files (*.*)|*.*";
        SaveFileDialog1.InitialDirectory = 
            Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

        // Call ShowDialog and check for a return value of DialogResult.OK,
        // which indicates that the file was saved. 
        DialogResult result = SaveFileDialog1.ShowDialog();
        Stream fileStream;

        if (result == DialogResult.OK)
        {
            // Open the file, copy the contents of memoryStream to fileStream,
            // and close fileStream. Set the memoryStream.Position value to 0 
            // to copy the entire stream. 
            fileStream = SaveFileDialog1.OpenFile();
            userInput.Position = 0;
            userInput.WriteTo(fileStream);
            fileStream.Close();
        }
    }
}
Imports System.Drawing
Imports System.IO
Imports System.Windows.Forms

Partial Public Class Form1
    Inherits Form

    Friend WithEvents RichTextBox1 As RichTextBox
    Friend WithEvents Button1 As Button
    Friend WithEvents RichTextBox2 As RichTextBox
    Friend WithEvents Button2 As Button
    Friend WithEvents SaveFileDialog1 As SaveFileDialog

    Public Sub New()
        MyBase.New()
        Me.RichTextBox1 = New RichTextBox
        Me.Button1 = New Button
        Me.RichTextBox2 = New RichTextBox
        Me.Button2 = New Button
        Me.SaveFileDialog1 = New SaveFileDialog
        Me.SuspendLayout()
        Me.RichTextBox1.Location = New Point(24, 64)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.TabIndex = 0
        Me.RichTextBox1.Text = "Type something here."
        Me.Button1.Location = New Point(96, 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New Size(96, 24)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Save To Stream"
        Me.RichTextBox2.Location = New Point(152, 64)
        Me.RichTextBox2.Name = "RichTextBox2"
        Me.RichTextBox2.TabIndex = 3
        Me.RichTextBox2.Text = "It will be added to the stream and appear here."
        Me.Button2.Location = New Point(104, 200)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New Size(88, 32)
        Me.Button2.TabIndex = 4
        Me.Button2.Text = "Save Stream To File"
        Me.ClientSize = New Size(292, 266)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.RichTextBox2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.RichTextBox1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

    Public Shared Sub Main()
        Application.Run(New Form1)
    End Sub

    ' Declare a new memory stream.
    Dim userInput As New MemoryStream

    ' Save the content of RichTextBox1 to the memory stream, appending
    'a LineFeed character.  
    Private Sub Button1_Click(ByVal sender As Object, _
        ByVal e As EventArgs) Handles Button1.Click
        RichTextBox1.SaveFile(userInput, RichTextBoxStreamType.PlainText)
        userInput.WriteByte(13)

        ' Display the entire contents of the stream,
        ' by setting its position to 0, to RichTextBox2.
        userInput.Position = 0
        RichTextBox2.LoadFile(userInput, RichTextBoxStreamType.PlainText)
    End Sub

    ' Shows the use of a SaveFileDialog to save a MemoryStream to a file.
    Private Sub Button2_Click(ByVal sender As Object, _
        ByVal e As EventArgs) Handles Button2.Click

        ' Set the properties on SaveFileDialog1 so the user is 
        ' prompted to create the file if it doesn't exist 
        ' or overwrite the file if it does exist.
        SaveFileDialog1.CreatePrompt = True
        SaveFileDialog1.OverwritePrompt = True

        ' Set the file name to myText.txt, set the type filter
        ' to text files, and set the initial directory to the 
        ' MyDocuments folder.
        SaveFileDialog1.FileName = "myText"
        ' DefaultExt is only used when "All files" is selected from 
        ' the filter box and no extension is specified by the user.
        SaveFileDialog1.DefaultExt = "txt"
        SaveFileDialog1.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"
        SaveFileDialog1.InitialDirectory = _
            Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)

        ' Call ShowDialog and check for a return value of DialogResult.OK,
        ' which indicates that the file was saved. 
        Dim result As DialogResult = SaveFileDialog1.ShowDialog()
        Dim fileStream As Stream

        If (result = DialogResult.OK) Then
            ' Open the file, copy the contents of memoryStream to fileStream,
            ' and close fileStream. Set the memoryStream.Position value to 0 to 
            ' copy the entire stream. 
            fileStream = SaveFileDialog1.OpenFile()
            userInput.Position = 0
            userInput.WriteTo(fileStream)
            fileStream.Close()
        End If
    End Sub

End Class

注解

您可以使用此版本的LoadFile方法,使用现有数据流中的数据RichTextBox加载。You can use this version of the LoadFile method to load the RichTextBox with data from an existing stream of data. 加载到控件中的数据将替换RichTextBox控件的全部内容。The data that is loaded into the control replaces the entire contents of the RichTextBox control. 这将导致TextRtf属性的值发生更改。This will cause the values of the Text and Rtf properties to change. 您可以使用此方法将以前打开到数据流中的文件加载到控件中进行操作。You can use this method to load a file that has been previously opened into a data stream into the control for manipulation. 如果要将控件的内容保存回流中,则可以使用SaveFile Stream接受对象作为参数的方法。If you want to save contents of the control back into the stream, you can use the SaveFile method that accepts a Stream object as a parameter.

此版本的LoadFile方法还允许您指定正在加载到控件中的数据的类型。This version of the LoadFile method also enables you to specify the type of data that is being loaded into the control. 利用此功能,您可以在控件中使用包含 rtf 以外的数据的数据流。This feature enables you to use data streams that contain data other than rich text format (RTF) documents into the control.

备注

LoadFile为创建RichTextBox句柄之前,方法将不会打开文件。The LoadFile method will not open a file until a handle is created for the RichTextBox. 确保在调用LoadFile方法之前创建控件的句柄。Ensure that the control's handle is created before calling the LoadFile method.

另请参阅

LoadFile(String, RichTextBoxStreamType) LoadFile(String, RichTextBoxStreamType) LoadFile(String, RichTextBoxStreamType) LoadFile(String, RichTextBoxStreamType)

将特定类型的文件加载到 RichTextBox 控件中。Loads a specific type of file into the RichTextBox control.

public:
 void LoadFile(System::String ^ path, System::Windows::Forms::RichTextBoxStreamType fileType);
public void LoadFile (string path, System.Windows.Forms.RichTextBoxStreamType fileType);
member this.LoadFile : string * System.Windows.Forms.RichTextBoxStreamType -> unit
Public Sub LoadFile (path As String, fileType As RichTextBoxStreamType)

参数

path
String String String String

要加载到控件中的文件的名称和位置。The name and location of the file to load into the control.

异常

将文件加载到控件中时出现错误。An error occurred while loading the file into the control.

所加载的文件不是 RTF 文档。The file being loaded is not an RTF document.

示例

下面的代码示例在RichTextBox控件中打开一个文本文件。The following code example opens a text file into the RichTextBox control. 该示例使用OpenFileDialog类来显示一个对话框,以便向用户请求该文件。The example uses the OpenFileDialog class to display a dialog to request the file from the user. 然后,该代码将文件加载到RichTextBox控件中。The code then loads that file into the RichTextBox control. 该示例使用LoadFile方法的此版本来指定文件作为 ASCII 文本文件而不是标准 rtf 格式打开。The example uses this version of the LoadFile method to specify that the file be opened as an ASCII text file instead of the standard rich text format. 此示例要求将代码放置在一个Form RichTextBox具有名为richTextBox1的控件的类中。This example requires that the code is placed in a Form class that has a RichTextBox control named richTextBox1.

public:
   void LoadMyFile()
   {
      // Create an OpenFileDialog to request a file to open.
      OpenFileDialog^ openFile1 = gcnew OpenFileDialog;
      
      // Initialize the OpenFileDialog to look for RTF files.
      openFile1->DefaultExt = "*.rtf";
      openFile1->Filter = "RTF Files|*.rtf";
      
      // Determine whether the user selected a file from the OpenFileDialog.
      if ( openFile1->ShowDialog() == System::Windows::Forms::DialogResult::OK &&
         openFile1->FileName->Length > 0 )
      {
         // Load the contents of the file into the RichTextBox.
         richTextBox1->LoadFile( openFile1->FileName, RichTextBoxStreamType::PlainText );
      }
   }
public void LoadMyFile()
{
   // Create an OpenFileDialog to request a file to open.
   OpenFileDialog openFile1 = new OpenFileDialog();

   // Initialize the OpenFileDialog to look for RTF files.
   openFile1.DefaultExt = "*.rtf";
   openFile1.Filter = "RTF Files|*.rtf";

   // Determine whether the user selected a file from the OpenFileDialog.
   if(openFile1.ShowDialog() == System.Windows.Forms.DialogResult.OK &&
      openFile1.FileName.Length > 0) 
   {
      // Load the contents of the file into the RichTextBox.
      richTextBox1.LoadFile(openFile1.FileName, RichTextBoxStreamType.PlainText);
   }
}

Public Sub LoadMyFile()
    ' Create an OpenFileDialog to request a file to open.
    Dim openFile1 As New OpenFileDialog()
    
    ' Initialize the OpenFileDialog to look for RTF files.
    openFile1.DefaultExt = "*.rtf"
    openFile1.Filter = "RTF Files|*.rtf"
    
    ' Determine whether the user selected a file from the OpenFileDialog.
    If (openFile1.ShowDialog() = System.Windows.Forms.DialogResult.OK) _
        And (openFile1.FileName.Length > 0) Then
        
        ' Load the contents of the file into the RichTextBox.
        richTextBox1.LoadFile(openFile1.FileName, _
            RichTextBoxStreamType.PlainText)
    End If
End Sub

注解

使用LoadFile方法加载文件时,要加载的文件的内容将替换RichTextBox控件的全部内容。When loading a file with the LoadFile method, the contents of the file being loaded replace the entire contents of the RichTextBox control. 这将导致TextRtf属性的值发生更改。This will cause the values of the Text and Rtf properties to change. 您可以使用此方法将以前创建的文本或 rtf 格式(RTF)文档加载到控件中进行操作。You can use this method to load a previously created text or rich text format (RTF) document into the control for manipulation. 如果要保存该文件,可以使用SaveFile方法。If you want to save the file, you can use the SaveFile method.

您可以使用此版本的LoadFile方法来指定要加载的文件的文件类型。You can use this version of the LoadFile method to specify the file type of the file being loaded. 利用此功能,您可以将 RTF 文档以外的文件加载到控件中。This feature enables you to load files other than RTF documents into the control.

备注

LoadFile为创建RichTextBox句柄之前,方法将不会打开文件。The LoadFile method will not open a file until a handle is created for the RichTextBox. 确保在调用LoadFile方法之前创建控件的句柄。Ensure that the control's handle is created before calling the LoadFile method.

安全性

FileIOPermission
用于打开文件。for opening a file. 关联的枚举:ReadFileIOPermissionAccess值。Associated enumeration: The Read value of FileIOPermissionAccess.

另请参阅

适用于