c# create 2d barcode Exercise 11-3. Creating a Custom Field Type Class in Font

Creation DataMatrix in Font Exercise 11-3. Creating a Custom Field Type Class

Exercise 11-3. Creating a Custom Field Type Class
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In this exercise, you will create the TimesFieldType class and add the minimum required code to get your class to work. 1. In your Solution Explorer, add a new class file to the EmpireTimes project. You can add this to the root of the folder or wherever you like. Name the file TimesFieldType.cs. 2. Add a using Microsoft.SharePoint; statement, make your class public, and then make your class inherit from the SPFieldText class. Your class should look like this: using using using using System; System.Collections.Generic; System.Text; Microsoft.SharePoint;
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namespace EmpireTimes { public class TimesFieldType : SPFieldText { } } 3. Next, add the following two constructors to your class: public TimesFieldType(SPFieldCollection fields, string fieldName) : base(fields, fieldName) { } public TimesFieldType(SPFieldCollection fields, string typeName, string displayName) : base(fields, typeName, displayName) { } That s it. Nothing more. You re done. You ve created your first custom field type.
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CHAPTER 11 STARTING FIELD
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OK, OK, hold on just one minute. People threaten to leave their jobs from fear of having to learn that Surely you must be joking, Mr. Norwegian. All those hours of fighting The therapy our team leader went through to prepare for custom field type development And you re saying that was it Yup, that s what I m saying. You re done. You ve made your own custom field type. Yes, there is plenty more you can do, but those three steps are all the steps you have to do (and the field type definition you created earlier, of course). Here s the deal: you inherit all the functionality of the parent field type text. As with all .NET classes, if you just inherit from the parent and don t add any functionality yourself, you get a copy, more or less, of the parent. If you still don t believe me, build your solution and deploy it. The easiest way to do this is to select the Tools WSPBuilder Build WSP menu in Visual Studio and then select WSPBuilder Deploy. Wait for solution deployment to complete, and go to your site. Create a new custom list, and add a new column to that list. The first thing you should see is what is in Figure 11-2.
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Figure 11-2. Your first custom field type available However, getting a new entry in the list of available column types requires only a field type definition. If you want to test that your custom field type actually works, go ahead and create that new column based on your type, and then go to the list.
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CHAPTER 11 STARTING FIELD
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Add a new item, and lo and behold, look at Figure 11-3 to see the result, if you did everything correctly.
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Figure 11-3. Input rendering of your custom field type Of course, since all you have done is inherited from the text field type, the custom field type behaves exactly like a text field type. Although you may think this is a complete waste of time and energy, rest assured that you will advance the example in the next exercise when you create your field type control. Perhaps the scary part resides here.
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Exercise 11-4. Creating a Custom Field Type Control Class
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In this exercise, you will expand your custom field type by adding a custom control to handle the rendering of the field type. You will do this by adding a class that derives from the BaseTextField parent class. 1. In your Solution Explorer, add a new class file to the EmpireTimes project. You can add this to the root of the folder or wherever you like. Name the file TimesFieldControl.cs. 2. Add a using Microsoft.SharePoint; statement and a using Microsoft.SharePoint. WebControls; statement, make your class public, and then make your class inherit from the BaseTextField class. Your class should look like this: using using using using System; System.Collections.Generic; System.Text; Microsoft.SharePoint.WebControls;
namespace EmpireTimes { public class TimesFieldControl : BaseTextField { } }
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