PictureBox 构造函数
定义
重要
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初始化 PictureBox 类的新实例。
public:
PictureBox();public PictureBox ();Public Sub New ()示例
下面的代码示例演示如何使用 PictureBox 和 ListView 控件。
PictureBox通过分别使用 BorderStyle 和 枚举设置 BorderStyle 和 SizeModePictureBoxSizeMode 属性来初始化 。 使用 ListView 示例图片目录中的图片填充 。 处理 ListView.GetItemAtMouseDown 控件的事件 ListView 时，使用 方法确定是否选择了项。 如果选择了某个项，则事件处理程序通过设置 Image 属性显示所选文件。 该示例要求将 JPG 文件位于 C：\Documents and Settings\All Users\Documents\My Pictures\Sample Pictures 目录中。 若要运行该示例，请将代码粘贴到窗体中，并在窗体的构造函数或Load事件处理方法中调用 InitializePictureBox 和 PopulateListView 方法。 确保所有事件都与其事件处理方法相关联。
private:
void PopulateListView()
{
ListView1->Width = 270;
ListView1->Location = System::Drawing::Point( 10, 10 );
// Declare and construct the ColumnHeader objects.
ColumnHeader^ header1;
ColumnHeader^ header2;
header1 = gcnew ColumnHeader;
header2 = gcnew ColumnHeader;
// Set the text, alignment and width for each column header.
header1->Text = "File name";
header1->TextAlign = HorizontalAlignment::Left;
header1->Width = 70;
header2->TextAlign = HorizontalAlignment::Left;
header2->Text = "Location";
header2->Width = 200;
// Add the headers to the ListView control.
ListView1->Columns->Add( header1 );
ListView1->Columns->Add( header2 );
// Specify that each item appears on a separate line.
ListView1->View = View::Details;
// Populate the ListView.Items property.
// Set the directory to the sample picture directory.
System::IO::DirectoryInfo^ dirInfo = gcnew System::IO::DirectoryInfo( "C:\\Documents and Settings\\All Users"
"\\Documents\\My Pictures\\Sample Pictures" );
// Get the .jpg files from the directory
array<System::IO::FileInfo^>^files = dirInfo->GetFiles( "*.jpg" );
// Add each file name and full name including path
// to the ListView.
if ( files != nullptr )
{
System::Collections::IEnumerator^ myEnum = files->GetEnumerator();
while ( myEnum->MoveNext() )
{
System::IO::FileInfo^ file = safe_cast<System::IO::FileInfo^>(myEnum->Current);
ListViewItem^ item = gcnew ListViewItem( file->Name );
item->SubItems->Add( file->FullName );
ListView1->Items->Add( item );
}
}
}
void InitializePictureBox()
{
PictureBox1 = gcnew PictureBox;
// Set the location and size of the PictureBox control.
this->PictureBox1->Location = System::Drawing::Point( 70, 120 );
this->PictureBox1->Size = System::Drawing::Size( 140, 140 );
this->PictureBox1->TabStop = false;
// Set the SizeMode property to the StretchImage value. This
// will shrink or enlarge the image as needed to fit into
// the PictureBox.
this->PictureBox1->SizeMode = PictureBoxSizeMode::StretchImage;
// Set the border style to a three-dimensional border.
this->PictureBox1->BorderStyle = BorderStyle::Fixed3D;
// Add the PictureBox to the form.
this->Controls->Add( this->PictureBox1 );
}
void ListView1_MouseDown( Object^ /*sender*/, MouseEventArgs^ e )
{
ListViewItem^ selection = ListView1->GetItemAt( e->X, e->Y );
// If the user selects an item in the ListView, display
// the image in the PictureBox.
if ( selection != nullptr )
{
PictureBox1->Image = System::Drawing::Image::FromFile( selection->SubItems[ 1 ]->Text );
}
}
private void PopulateListView()
{
ListView1.Width = 270;
ListView1.Location = new System.Drawing.Point(10, 10);
// Declare and construct the ColumnHeader objects.
ColumnHeader header1, header2;
header1 = new ColumnHeader();
header2 = new ColumnHeader();
// Set the text, alignment and width for each column header.
header1.Text = "File name";
header1.TextAlign = HorizontalAlignment.Left;
header1.Width = 70;
header2.TextAlign = HorizontalAlignment.Left;
header2.Text = "Location";
header2.Width = 200;
// Add the headers to the ListView control.
ListView1.Columns.Add(header1);
ListView1.Columns.Add(header2);
// Specify that each item appears on a separate line.
ListView1.View = View.Details;
// Populate the ListView.Items property.
// Set the directory to the sample picture directory.
System.IO.DirectoryInfo dirInfo =
new System.IO.DirectoryInfo(
"C:\\Documents and Settings\\All Users" +
"\\Documents\\My Pictures\\Sample Pictures");
// Get the .jpg files from the directory
System.IO.FileInfo[] files = dirInfo.GetFiles("*.jpg");
// Add each file name and full name including path
// to the ListView.
if (files != null)
{
foreach ( System.IO.FileInfo file in files )
{
ListViewItem item = new ListViewItem(file.Name);
item.SubItems.Add(file.FullName);
ListView1.Items.Add(item);
}
}
}
private void InitializePictureBox()
{
PictureBox1 = new PictureBox();
// Set the location and size of the PictureBox control.
this.PictureBox1.Location = new System.Drawing.Point(70, 120);
this.PictureBox1.Size = new System.Drawing.Size(140, 140);
this.PictureBox1.TabStop = false;
// Set the SizeMode property to the StretchImage value. This
// will shrink or enlarge the image as needed to fit into
// the PictureBox.
this.PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
// Set the border style to a three-dimensional border.
this.PictureBox1.BorderStyle = BorderStyle.Fixed3D;
// Add the PictureBox to the form.
this.Controls.Add(this.PictureBox1);
}
private void ListView1_MouseDown(object sender, MouseEventArgs e)
{
ListViewItem selection = ListView1.GetItemAt(e.X, e.Y);
// If the user selects an item in the ListView, display
// the image in the PictureBox.
if (selection != null)
{
PictureBox1.Image = System.Drawing.Image.FromFile(
selection.SubItems[1].Text);
}
}
Private Sub PopulateListView()
ListView1.Width = 270
ListView1.Location = New System.Drawing.Point(10, 10)
' Declare and construct the ColumnHeader objects.
Dim header1, header2 As ColumnHeader
header1 = New ColumnHeader
header2 = New ColumnHeader
' Set the text, alignment and width for each column header.
header1.Text = "File name"
header1.TextAlign = HorizontalAlignment.Left
header1.Width = 70
header2.TextAlign = HorizontalAlignment.Left
header2.Text = "Location"
header2.Width = 200
' Add the headers to the ListView control.
ListView1.Columns.Add(header1)
ListView1.Columns.Add(header2)
' Specify that each item appears on a separate line.
ListView1.View = View.Details
' Populate the ListView.Items property.
' Set the directory to the sample picture directory.
Dim dirInfo As New System.IO.DirectoryInfo _
("C:\Documents and Settings\All Users" _
& "\Documents\My Pictures\Sample Pictures")
Dim file As System.IO.FileInfo
' Get the .jpg files from the directory
Dim files() As System.io.FileInfo = dirInfo.GetFiles("*.jpg")
' Add each file name and full name including path
' to the ListView.
If (files IsNot Nothing) Then
For Each file In files
Dim item As New ListViewItem(file.Name)
item.SubItems.Add(file.FullName)
ListView1.Items.Add(item)
Next
End If
End Sub
Private Sub InitializePictureBox()
PictureBox1 = New PictureBox
' Set the location and size of the PictureBox control.
Me.PictureBox1.Location = New System.Drawing.Point(70, 120)
Me.PictureBox1.Size = New System.Drawing.Size(140, 140)
Me.PictureBox1.TabStop = False
' Set the SizeMode property to the StretchImage value. This
' will shrink or enlarge the image as needed to fit into
' the PictureBox.
Me.PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
' Set the border style to a three-dimensional border.
Me.PictureBox1.BorderStyle = BorderStyle.Fixed3D
' Add the PictureBox to the form.
Me.Controls.Add(Me.PictureBox1)
End Sub
Private Sub ListView1_MouseDown(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles ListView1.MouseDown
Dim selection As ListViewItem = ListView1.GetItemAt(e.X, e.Y)
' If the user selects an item in the ListView, display
' the image in the PictureBox.
If (selection IsNot Nothing) Then
PictureBox1.Image = System.Drawing.Image.FromFile _
(selection.SubItems(1).Text)
End If
End Sub
注解
下表显示了 PictureBox 类的某个实例的初始属性值。
| 项 | 说明 |
|---|---|
| Image | null |
| SizeMode | Normal |
