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Article ID: 814358 - Last Review: December 3, 2007 - Revision: 2.11
Compile error when you try to create an instance of System.Drawing.Imaging.PropertyItem
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SYMPTOMS
When you try to create an instance of a
PropertyItem object in a project that you try to compile, you receive one of
the following error messages:
Visual Basic .NET Error'System.Drawing.Imaging.PropertyItem.Private
Overloads Sub New()' is not accessible in this context because it is
'Private'.
error BC30251: Type 'System.Drawing.Imaging.PropertyItem' has no constructors.
'System.Drawing.Imaging.PropertyItem.PropertyItem()' is
inaccessible due to its protection level.
error CS0143: The type 'System.Drawing.Imaging.PropertyItem' has no constructors defined
CAUSE
A
PropertyItem object encapsulates a metadata property to be included in an
image file. A
PropertyItem object is not intended to be used a stand-alone object. A
PropertyItem object is intended to be used by classes that are derived from
System.Drawing.Image. A
PropertyItem object is used to retrieve and change the metadata of existing
image files, not to create the metadata. Therefore, the
PropertyItem class does not have a defined Public constructor, and you cannot
create an instance of a
PropertyItem object.
WORKAROUND
To work around this problem, use an existing
PropertyItem object instead of creating a new instance of the
PropertyItem class. To do this, use the following code sample:
Visual Basic .NET or Visual Basic 2005 Sample Code
' Create a Bitmap Image to access a PropertyItem object.
Dim MyImage As System.Drawing.Bitmap
MyImage = New System.Drawing.Bitmap("C:\Sample.jpg") ' Refer to some existing .JPEG image.
' Define a PropertyItem variable.
Dim pItem As System.Drawing.Imaging.PropertyItem
' Instead of creating a new instance of PropertyItem, use an existing PropertyItem object.
For Each pItem In MyImage.PropertyItems
' You can modify the pItem object now.
Exit For
NextVisual C# .NET or Visual C# 2005 Sample Code
// Create a Bitmap Image to access a PropertyItem object.
System.Drawing.Bitmap MyImage;
MyImage = new System.Drawing.Bitmap("C:\\Sample.jpg"); // Refer to some existing .JPEG image.
// Define a PropertyItem variable.
// Instead of creating a new instance of PropertyItem, use an existing PropertyItem object.
foreach (System.Drawing.Imaging.PropertyItem pItem in MyImage.PropertyItems)
{
// You can modify the pItem object now.
break;
} For this code to work correctly, you should have a reference to
the System.Drawing.dll assembly.
STATUS
This
behavior is by design.
MORE INFORMATION
Steps to Reproduce the Behavior
- Open Microsoft Visual Studio .NET or Microsoft Visual Studio 2005. Create a Windows
application named PropertyItemDemo by using Visual Basic
.NET, Visual Basic 2005, Visual C# 2005, or Visual C# .NET.
By default, Form1 is
created. - Append the following code to the
Form1_Load() event handler:
Visual Basic .NET or Visual Basic 2005 Sample CodeDim pItem As New System.Drawing.Imaging.PropertyItem
System.Drawing.Imaging.PropertyItem pItem = new System.Drawing.Imaging.PropertyItem();
- On the Build menu, click Build
Solution.
You receive the error mentioned in the "Symptoms"
section of this article.
REFERENCES
For additional information, visit the following MSDN Web
sites:
APPLIES TO
- Microsoft .NET Framework 1.1
- Microsoft .NET Framework 1.0
- Microsoft Visual Basic .NET 2003 Standard Edition
- Microsoft Visual C# .NET 2003 Standard Edition
- Microsoft Visual Basic .NET 2002 Standard Edition
- Microsoft Visual C# .NET 2002 Standard Edition
- Microsoft Visual C# 2005 Express Edition
- Microsoft Visual Basic 2005
- Microsoft .NET Framework 2.0
| kbvs2005applies kbvs2005swept kbprogramming kbgdipimaging kbdraw kbprb KB814358 |
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