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Add a Reference to Base Web Part DLL Created Earlier
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After you create the project, you need to reference the Base class. If you added the SQL web part project to the same solution as the Base web part class, you can use a project reference, which is the preferred method. To do so, right-click the References section of the SQL Project Explorer and choose Add Reference. Click the Projects tab to add the Base web part class, as shown in Figure 4-17.
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Figure 4-17. Adding a reference to the Base web part class
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CHAPTER 4 CREATING THE CUSTOM BUILDING BLOCKS
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Inheriting from the Base Web Part Class
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Because I want the SQL web part to inherit the authorization and hiding behavior of the Base web part, I need to change the default inheritance used in Webpart1.vb. The class header should be changed from the following: Public Class WebPart1 Inherits Microsoft.SharePoint.WebPartPages.WebPart to the following: Public Class WebPart1 Inherits MG.Base.WebPart1
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Add the Necessary Web Part Properties
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The SQL web part needs to know which SQL source to connect to and which query to issue to return the desired result set. We also need to tell it whether to display its output using a DataGrid or format it using XSLT. Listing 4-6 shows you how to write the code that defines the necessary properties. Listing 4-6. Defining the SQL Web Part Properties ' Create local variables to hold property data Dim _connectionString As String = "" Dim _connectionKey As String = "" Dim _query As String = "" Dim _formatUsing As enumFormatUsing = enumFormatUsing.DataGrid Dim _xsltPath As String = "" ' Using an enum for a property type creates a drop-down list Public Enum enumFormatUsing DataGrid = 1 XSLT = 2 End Enum <Browsable(True), Category("SQL"), DefaultValue(_defaultText), _ WebPartStorage(Storage.Personal), _ FriendlyName("Connection String"), _ Description("SQL connection string")> _ Property ConnectionString() As String Get Return _connectionString End Get Set(ByVal Value As String) _connectionString = Value End Set End Property
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<Browsable(True), Category("SQL"), DefaultValue(_defaultText), _ WebPartStorage(Storage.Personal), _ FriendlyName("Connection Key in Web.config"), _ Description("Refers to a web.config key for connection string")> _ Property ConnectionKey() As String Get Return _connectionKey End Get Set(ByVal Value As String) _connectionKey = Value End Set End Property <Browsable(True), Category("SQL"), DefaultValue(_defaultText), _ WebPartStorage(Storage.Personal), FriendlyName("SQL Query"), _ Description("Text Property")> _ Property Query() As String Get Return _query End Get Set(ByVal Value As String) _query = Value End Set End Property <Browsable(True), Category("SQL"), DefaultValue(enumFormatUsing.DataGrid), _ WebPartStorage(Storage.Personal), FriendlyName("Format output using"), _ Description("How to format the output from the data source.")> _ Property FormatUsing() As enumFormatUsing Get Return _formatUsing End Get Set(ByVal Value As enumFormatUsing) _formatUsing = Value End Set End Property <Browsable(True), Category("SQL"), DefaultValue(""), _ WebPartStorage(Storage.Personal), FriendlyName("XSLT path"), _ Description("Path to XSLT to format data with.")> _ Property XSLTPath() As String Get Return _xsltPath End Get Set(ByVal Value As String) _xsltPath = Value End Set End Property
CHAPTER 4 CREATING THE CUSTOM BUILDING BLOCKS
Update the RenderWebPart() Method to Display Results
The RenderWebPart() method is where the rubber meets the road for a web part; it s where the web part s HTML is written to the web part page. In addition to writing out the results of the SQL query, we need to display the debug information from the Base class if the Debug property has been set to True through the web part s tool part property sheet. Listing 4-7 shows the RenderWebPart() method code for the SQL web part.
Note To render the debug information supplied by the Base web part, we use the MyBase.
ShowDebugText() method call. MyBase refers to the parent class of the current class, which in
this case is the Base web part.
Listing 4-7. RenderWebPart Method 'Render this Web Part to the output parameter specified. Protected Overrides Sub RenderWebPart(ByVal output As System.Web.UI.HtmlTextWriter) Try If Debug Then MyBase.ShowDebugText(output) output.Write("<hr>") output.Write("<b><u>SQL variables</u></b><br>") output.Write("Connection string = <b>" & ConnectionString & "</b><br>") output.Write("Connection key = <b>" & ConnectionKey & "</b><br>") output.Write("SQL query = <b>" & Query & "</b><br>") output.Write("Format output using = <b>" & FormatUsing.ToString & "</b><br>") output.Write("XSLT path = <b>" & XSLTPath & "</b><br>") output.Write("<hr>") End If If CanAccess() Then RenderSourceData(ReadSourceData(output), output) End If Catch ex As Exception output.Write("<font color=red>" & ex.Message & "</font><br>") End Try End Sub The function in Listing 4-8 checks to see whether the user has provided a full connection string in the ConnectionString property, or provided a web.config key where the full connection string can be found.
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