SaveFileDialog.OverwritePrompt プロパティとは？ わかりやすく解説

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SaveFileDialog.OverwritePrompt プロパティ

ユーザーが既に存在するファイル名を指定した場合に [名前を付けて保存] ダイアログ ボックスで警告を表示するかどうかを示す値を取得または設定します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文構文

Visual Basic (宣言)
Public Property OverwritePrompt As
 Boolean
Visual Basic (使用法)
Dim instance As SaveFileDialog
Dim value As Boolean

value = instance.OverwritePrompt

instance.OverwritePrompt = value
C#
public bool OverwritePrompt { get;
 set; }
C++
public:
property bool OverwritePrompt {
    bool get ();
    void set (bool value);
}
J#
/** @property */
public boolean get_OverwritePrompt ()

/** @property */
public void set_OverwritePrompt (boolean value)
JScript
public function get OverwritePrompt
 () : boolean

public function set OverwritePrompt
 (value : boolean)

プロパティ値
ユーザーが既に存在するファイル名を指定していて、ダイアログ ボックスで既存のファイルを上書きする前にメッセージを表示する場合は true。ダイアログ ボックスでファイル上書きを確認するメッセージを表示せずに、既存のファイルが自動的に上書きされる場合は false。既定値は true です。

使用例使用例

RichTextBox.SaveFile メソッドと RichTextBox.LoadFile メソッドをストリームと一緒に使用するコード例を次に示します。また、この例では、FileName メンバ、DefaultExt メンバ、CreatePrompt メンバ、および OverwritePrompt メンバも使用しています。

これは完成された例であるため、プロジェクトにコピーすると実行できます。

Visual Basic
Imports System.Windows.Forms

Public Class Form1
    Inherits System.Windows.Forms.Form

    Friend WithEvents RichTextBox1 As
 System.Windows.Forms.RichTextBox
    Friend WithEvents Button1 As
 System.Windows.Forms.Button
    Friend WithEvents RichTextBox2 As
 System.Windows.Forms.RichTextBox
    Friend WithEvents Button2 As
 System.Windows.Forms.Button
    Friend WithEvents SaveFileDialog1 As
 System.Windows.Forms.SaveFileDialog

    Public Sub New()
        MyBase.New()
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.RichTextBox2 = New System.Windows.Forms.RichTextBox
        Me.Button2 = New System.Windows.Forms.Button
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog
        Me.SuspendLayout()
        Me.RichTextBox1.Location = New System.Drawing.Point(24,
 64)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.TabIndex = 0
        Me.RichTextBox1.Text = "Type something
 here."
        Me.Button1.Location = New System.Drawing.Point(96,
 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96,
 24)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Save To Stream"
        Me.RichTextBox2.Location = New System.Drawing.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 System.Drawing.Point(104,
 200)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(88,
 32)
        Me.Button2.TabIndex = 4
        Me.Button2.Text = "Save Stream To File"
        Me.ClientSize = New System.Drawing.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
 System.IO.MemoryStream

    ' Save the content of RichTextBox1 to the memory stream, appending
    'a LineFeed character.  
    Private Sub Button1_Click(ByVal
 sender As System.Object, _
        ByVal e As System.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 System.Object, _
        ByVal e As System.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 drive C.
        SaveFileDialog1.FileName = "myText"
        SaveFileDialog1.DefaultExt = "txt"
        SaveFileDialog1.Filter = "Text files (*.txt)|*.txt"
        SaveFileDialog1.InitialDirectory = "c:\"

        ' 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 System.IO.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
C#
using System.Windows.Forms;



public class Form1:
    System.Windows.Forms.Form

{
    
    internal System.Windows.Forms.RichTextBox RichTextBox1;
    internal System.Windows.Forms.Button Button1;
    internal System.Windows.Forms.RichTextBox RichTextBox2;
    internal System.Windows.Forms.Button Button2;
    internal System.Windows.Forms.SaveFileDialog SaveFileDialog1;

    public Form1() : base()
    {   
        
        this.RichTextBox1 = new System.Windows.Forms.RichTextBox();
        this.Button1 = new System.Windows.Forms.Button();
        this.RichTextBox2 = new System.Windows.Forms.RichTextBox();
        this.Button2 = new System.Windows.Forms.Button();
        this.SaveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
        this.SuspendLayout();
        this.RichTextBox1.Location = new System.Drawing.Point(24,
 64);
        this.RichTextBox1.Name = "RichTextBox1";
        this.RichTextBox1.TabIndex = 0;
        this.RichTextBox1.Text = "Type something here.";
        this.Button1.Location = new System.Drawing.Point(96,
 16);
        this.Button1.Name = "Button1";
        this.Button1.Size = new System.Drawing.Size(96,
 24);
        this.Button1.TabIndex = 1;
        this.Button1.Text = "Save To Stream";
        this.Button1.Click += new System.EventHandler(Button1_Click);
        this.RichTextBox2.Location = new System.Drawing.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 System.Drawing.Point(104,
 200);
        this.Button2.Name = "Button2";
        this.Button2.Size = new System.Drawing.Size(88,
 32);
        this.Button2.TabIndex = 4;
        this.Button2.Text = "Save Stream To File";
        this.Button2.Click += new System.EventHandler(Button2_Click);
        this.ClientSize = new System.Drawing.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.
    System.IO.MemoryStream userInput = new System.IO.MemoryStream();

    // Save the content of RichTextBox1 to the memory stream, 
    // appending a LineFeed character.  
    private void Button1_Click(System.Object
 sender, 
        System.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(System.Object
 sender, System.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 drive C.
        SaveFileDialog1.FileName = "myText";
        SaveFileDialog1.DefaultExt = "txt";
        SaveFileDialog1.Filter = "Text files (*.txt)|*.txt";
        SaveFileDialog1.InitialDirectory = "c:\\";

        // Call ShowDialog and check for a return value of DialogResult.OK
,
        // which indicates that the file was saved. 
        DialogResult result = SaveFileDialog1.ShowDialog();
        System.IO.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();
        }
    }
}
C++
using namespace System::Windows::Forms;
public ref class Form1: public
 System::Windows::Forms::Form
{
public private:
   System::Windows::Forms::RichTextBox^ RichTextBox1;
   System::Windows::Forms::Button^ Button1;
   System::Windows::Forms::RichTextBox^ RichTextBox2;
   System::Windows::Forms::Button^ Button2;
   System::Windows::Forms::SaveFileDialog^ SaveFileDialog1;

public:
   Form1()
      : Form()
   {
      userInput = gcnew System::IO::MemoryStream;
      this->RichTextBox1 = gcnew System::Windows::Forms::RichTextBox;
      this->Button1 = gcnew System::Windows::Forms::Button;
      this->RichTextBox2 = gcnew System::Windows::Forms::RichTextBox;
      this->Button2 = gcnew System::Windows::Forms::Button;
      this->SaveFileDialog1 = gcnew System::Windows::Forms::SaveFileDialog;
      this->SuspendLayout();
      this->RichTextBox1->Location = System::Drawing::Point(
 24, 64 );
      this->RichTextBox1->Name = "RichTextBox1";
      this->RichTextBox1->TabIndex = 0;
      this->RichTextBox1->Text = "Type something here.";
      this->Button1->Location = System::Drawing::Point(
 96, 16 );
      this->Button1->Name = "Button1";
      this->Button1->Size = System::Drawing::Size( 96, 24
 );
      this->Button1->TabIndex = 1;
      this->Button1->Text = "Save To Stream";
      this->Button1->Click += gcnew System::EventHandler(
 this, &Form1::Button1_Click );
      this->RichTextBox2->Location = System::Drawing::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 = System::Drawing::Point(
 104, 200 );
      this->Button2->Name = "Button2";
      this->Button2->Size = System::Drawing::Size( 88, 32
 );
      this->Button2->TabIndex = 4;
      this->Button2->Text = "Save Stream To File";
      this->Button2->Click += gcnew System::EventHandler(
 this, &Form1::Button2_Click );
      this->ClientSize = System::Drawing::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.
   System::IO::MemoryStream^ userInput;

private:

   // Save the content of RichTextBox1 to the memory stream, 
   // appending a LineFeed character.  
   void Button1_Click( System::Object^ /*sender*/, System::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( System::Object^ /*sender*/, System::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 drive C.
      SaveFileDialog1->FileName = "myText";
      SaveFileDialog1->DefaultExt = "txt";
      SaveFileDialog1->Filter = "Text files (*.txt)|*.txt";
      SaveFileDialog1->InitialDirectory = "c:\\";
      
      // Call ShowDialog and check for a return value of DialogResult.OK
,
      // which indicates that the file was saved. 
      System::Windows::Forms::DialogResult result = SaveFileDialog1->ShowDialog();
      System::IO::Stream^ fileStream;
      if ( result == ::DialogResult::OK )
      {
         fileStream = SaveFileDialog1->OpenFile();
         userInput->Position = 0;
         userInput->WriteTo( fileStream );
         fileStream->Close();
      }
   }

};

int main()
{
   Application::Run( gcnew Form1 );
}
J#
import System.Windows.Forms.*;

public class Form1 extends System.Windows.Forms.Form
{
    System.Windows.Forms.RichTextBox richTextBox1;
    System.Windows.Forms.Button button1;
    System.Windows.Forms.RichTextBox richTextBox2;
    System.Windows.Forms.Button button2;
    System.Windows.Forms.SaveFileDialog saveFileDialog1;

    public Form1()
    {
        super();
        this.richTextBox1 = new System.Windows.Forms.RichTextBox();
        this.button1 = new System.Windows.Forms.Button();
        this.richTextBox2 = new System.Windows.Forms.RichTextBox();
        this.button2 = new System.Windows.Forms.Button();
        this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
        this.SuspendLayout();
        this.richTextBox1.set_Location(new
 System.Drawing.Point(24, 64));
        this.richTextBox1.set_Name("RichTextBox1");
        this.richTextBox1.set_TabIndex(0);
        this.richTextBox1.set_Text("Type something here.");
        this.button1.set_Location(new System.Drawing.Point(96,
 16));
        this.button1.set_Name("Button1");
        this.button1.set_Size(new System.Drawing.Size(96,
 24));
        this.button1.set_TabIndex(1);
        this.button1.set_Text("Save To Stream");
        this.button1.add_Click(new System.EventHandler(button1_Click));
        this.richTextBox2.set_Location(new
 System.Drawing.Point(152, 64));
        this.richTextBox2.set_Name("RichTextBox2");
        this.richTextBox2.set_TabIndex(3);
        this.richTextBox2.set_Text("It will be added to the
 stream "
            + "and appear here.");
        this.button2.set_Location(new System.Drawing.Point(104,
 200));
        this.button2.set_Name("Button2");
        this.button2.set_Size(new System.Drawing.Size(88,
 32));
        this.button2.set_TabIndex(4);
        this.button2.set_Text("Save Stream To File");
        this.button2.add_Click(new System.EventHandler(button2_Click));
        this.set_ClientSize(new System.Drawing.Size(292,
 266));
        this.get_Controls().Add(this.button2);
        this.get_Controls().Add(this.richTextBox2);
        this.get_Controls().Add(this.button1);
        this.get_Controls().Add(this.richTextBox1);
        this.set_Name("Form1");
        this.set_Text("Form1");
        this.ResumeLayout(false);
    } //Form1

    public static void main(String[]
 args)
    {
        Application.Run(new Form1());
    } //main

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

    // Save the content of RichTextBox1 to the memory stream, 
    // appending a LineFeed character.  
    private void button1_Click(Object sender,
 System.EventArgs e)
    {
        richTextBox1.SaveFile(userInput, RichTextBoxStreamType.PlainText);
        userInput.WriteByte(System.Convert.ToByte(13));
        // Display the entire contents of the stream,
        // by setting its position to 0, to RichTextBox2.
        userInput.set_Position(0);
        richTextBox2.LoadFile(userInput, RichTextBoxStreamType.PlainText);
    } //button1_Click

    // Shows the use of a SaveFileDialog to save a MemoryStream to a
 file.
    private void button2_Click(Object sender,
 System.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.set_CreatePrompt(true);
        saveFileDialog1.set_OverwritePrompt(true);
        // Set the file name to myText.txt, set the type filter
        // to text files, and set the initial directory to drive C.
        saveFileDialog1.set_FileName("myText");
        saveFileDialog1.set_DefaultExt("txt");
        saveFileDialog1.set_Filter("Text files (*.txt)|*.txt");
        saveFileDialog1.set_InitialDirectory("c:\\");
        // Call ShowDialog and check for a return value of DialogResult.OK
,
        // which indicates that the file was saved. 
        DialogResult result = saveFileDialog1.ShowDialog();
        System.IO.Stream fileStream;

        if (result.Equals(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.set_Position(0);
            userInput.WriteTo(fileStream);
            fileStream.Close();
        }
    } //button2_Click
} //Form1
.NET Framework のセキュリティ.NET Framework のセキュリティ
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
参照参照
関連項目
SaveFileDialog クラス
SaveFileDialog メンバ
System.Windows.Forms 名前空間

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「SaveFileDialog.OverwritePrompt プロパティ」の関連用語

1
FileDialog.FileName プロパティ
.NET Framework クラス ライブラリ リファレンス
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2
FileDialog.DefaultExt プロパティ
.NET Framework クラス ライブラリ リファレンス
10% |||||

SaveFileDialog.OverwritePrompt プロパティのお隣キーワード

SaveFileDialog コンストラクタ

SaveFileDialog プロパティ

SaveFileDialog メソッド

SaveFileDialog メンバ

SaveFileDialog.CreatePrompt プロパティ

SaveFileDialog.OpenFile メソッド

SaveFileDialog.OverwritePrompt プロパティ

SaveFileDialog.Reset メソッド

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