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Okay, I m sure you are just as sick of the Hello World part as I am, so instead you re going to do some actual work here In addition, I m going to include the main methods used for development of real parts (not just the Render) and demonstrate how to manage Postback The end goal of this example is to create a new web part called HowManyLists; the simple
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function will be that when a button is pressed, it will determine how many lists are in the site and display the count To make this complete, you ll track the times the part has been loaded and handle the Postback, and you ll also add a custom property and set it using the webpart file Suffice it to say that this one part demonstrates all of the following: Order in which methods execute Using of custom properties and interaction with the web part properties Using of embedded resources (setting the display title) Using of ViewState (storing hits) Handling Postback events (responding to a button click) Error handling (trapping expected errors) To start building the part, do the following: 1 First, rename the class in the code Change WebPart1 to HMLClass 2 Right-click on the WebPart1cs file in the Solution Explorer window and then select Rename Change the name to be HMLClasscs; when you re done, your project should look similar to this:
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3 Enter in the following code around the existing code you already created previously and remember to leave the GUID assigned by your project as is (don t use the one shown) Note comments, of course, are optional:
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using using using using using using using using using using using using using System; System; SystemRuntimeInteropServices; SystemWebUI; SystemWebUIWebControlsWebParts; SystemXmlSerialization; MicrosoftSharePoint; MicrosoftSharePointWebControls; MicrosoftSharePointWebPartPages; SystemWebUIWebControls; // Added SystemDrawing; // Added SystemText; // Added SystemResources; // Added
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namespace HowManyLists { [Guid("3c478a67-d437-4e8a-b2eb-2650ad26088b")] public class HMLClass : SystemWebUIWebControlsWebPartsWebPart { // Save for times checked: public int HitCount; public string OurDisplayTitle = "Get List Count"; //================================================================== // Define Child Controls protected Label DisplayCount = new Label(); protected Button CalcListCount = new Button(); //================================================================== // PROPERTY: ShowHitCount // This is a settable flag that turns the Hit Count display // On or Off (Checked = True or On) Note that you set the default // as true (you will override this in the webpart file) // Also notice the XML settings - these set the web part property // category to "Custom Settings" (this is what displays when // the web part properties are displayed), sets the storage to be // Shared (setting applies to all users), sets personalization to // be shared and is browsable (visible) in the web part properties private const bool defaultShowHitCount = false; private bool showHitCount = defaultShowHitCount; [SPWebCategoryName("Custom Settings"), WebPartStorage(StorageShared), WebBrowsable(true), Personalizable(PersonalizationScopeShared), WebDescription("Sets true/false to show hit count"), WebDisplayName("Check to show hit count")] public bool ShowHitCount { get { return showHitCount; } set { showHitCount = value; } } //================================================================== // METHODS: //================================================================== // The following are the various methods as executed in the order // shown (this is EXACTLY the same as a Web Control): //================================================================== // ONINIT EVENT: // Fires 1st: Startup of the Control and where in web parts, the // storage system is loaded; also calls LoadViewState (loads the // view state for all controls); if you uncomment this event, you // MUST include the baseOnInit(e) line This is the best // place to define controls that are added to the part // protected override void OnInit(SystemEventArgs e) { baseOnInit(e); // You must include this if you override // // Create the label: // DisplayCountID = "DisplayCount"; DisplayCountText = ""; DisplayCountForeColor = SystemDrawingColorBlue;
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