SaveFileDialog.OverwritePrompt Property
Definition
Important
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Gets or sets a value indicating whether the Save As dialog box displays a warning if the user specifies a file name that already exists.
public:
property bool OverwritePrompt { bool get(); void set(bool value); };public bool OverwritePrompt { get; set; }member this.OverwritePrompt : bool with get, setPublic Property OverwritePrompt As BooleanProperty Value
true if the dialog box prompts the user before overwriting an existing file if the user specifies a file name that already exists; false if the dialog box automatically overwrites the existing file without prompting the user for permission. The default value is true.
Examples
The following code example demonstrates using the RichTextBox.SaveFile and RichTextBox.LoadFile methods with streams. It also demonstrates using the FileName, DefaultExt, CreatePrompt, and OverwritePrompt members.
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
Applies to
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