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Figure 12-13. Automatically generated TreeView bindings The TreeView s default XML representation still needs a lot to be desired. It shows only the document structure (the element names), not the document content (the element text). It also ignores attributes. To improve this situation, you need to set the TreeView.AutoGenerateDataBindings property to false, and you then need to explicitly map different parts of the XML document to TreeView nodes. <asp:TreeView ID="TreeView1" runat="server" DataSourceID="sourceDVD" AutoGenerateDataBindings="False"> ... </asp:TreeView> To create a TreeView mapping, you need to add <TreeNodeDataBinding> elements to the <DataBinding> section. You must start with the root element and then add a binding for each level you want to show. You cannot skip any levels.

The file is a sparse file. Sparse files are typically large files with data consisting of mostly zeros. This item is supported only on NTFS file systems. The item is part of the operating system or is used exclusively by the operating system. This item is temporary and can be deleted when the application is no longer using it.

Directory DirectoryName Length CopyTo()

The approach you use to customize bindings with a TreeView is not completely finalized and may change in the final release of ASP.NET 2.0.

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To examine the attributes on a file, you can use the GetAttributes() method and the FileAttributes enumeration as shown here: If (FileGetAttributes(path) And FileAttributesHidden) = FileAttributesHidden Then .. Next You can also call the ToString() method of the Attributes property This returns a string with a comma-separated list of attributes: ' This displays a string in the format "ReadOnly, Archive, Encrypted" lblInfoText = myFileAttributesToString() When testing for a single specific attribute, you need to use bitwise arithmetic For example, consider the following faulty code: If myFileAttributes = FileAttributesReadOnly Then .. End If This test succeeds only if the read-only attribute is the only attribute for the current file This is rarely the case If you want to successfully check whether the file is read-only, you need this code instead: If (myFileAttributes And FileAttributesReadOnly) = FileAttributesReadOnly Then ...

Returns a DirectoryInfo object that represents the parent directory. Returns a string that identifies the name of the parent directory. Returns a long (64-bit integer) with the file size in bytes. Copies a file to the new path and filename specified as a parameter. It also returns a new FileInfo object that represents the new (copied) file. You can supply an optional additional parameter of true to allow overwriting. Creates the specified file and returns a FileStream object that you can use to write to it. CreateText() performs the same task but returns a StreamWriter object that wraps the stream. Opens a file (provided it exists). OpenRead() and OpenText() open a file in read-only mode, returning a FileStream or StreamReader. OpenWrite() opens a file in write-only mode, returning a FileStream.

Each <TreeNodeDataBinding> must name the node it binds to (through the DataMember property), the text it should display (DataField), and the hidden value for the node (ValueField). Unfortunately, both DataField and ValueField are designed to bind to attributes. If you want to bind to element content, you can use an ugly hack and specify the #InnerText code. However, this shows all the inner text, including text inside other more deeply nested nodes.

End If This test succeeds because it filters out just the read-only attribute Essentially, the Attributes setting consists (in binary) of a series of ones and zeros, such as 00010011 Each 1 represents an attribute that is present, and each 0 represents an attribute that is not When you use the And operator with an enumerated value, it automatically performs a bitwise and operation, which compares each digit against each digit in the enumerated value For example, if you combine a value of 00100001 (representing an individual file s archive and read-only attributes) with the enumerated value 00000001 (which represents the read-only flag), the resulting value will be 00000001 It will have a 1 only where it can be matched in both values You can then test this resulting value against the FileAttributesReadOnly enumerated value using the equal sign.

Create() and CreateText() Open(), OpenRead(), OpenText(), and OpenWrite()

The next example defines a basic set of nodes to show the movie title information: <asp:TreeView ID="TreeView1" runat="server" DataSourceID="sourceDVD" AutoGenerateDataBindings="False"> <DataBindings> <asp:TreeNodeBinding DataMember="DvdList" Text="Root" Value="Root" /> <asp:TreeNodeBinding DataMember="DVD" TextField="ID" /> <asp:TreeNodeBinding DataMember="Title" TextField="#InnerText" /> </DataBindings> </asp:TreeView> Figure 12-14 shows the result.

Similar logic allows you to verify that a file does not have a specific attribute: If Not(myFileAttributes And FileAttributesReadOnly) = FileAttributesReadOnly Then .. End If When setting an attribute, you must also use bitwise arithmetic In this case, it s needed to ensure that you don t inadvertently wipe out the other attributes that are already set..

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