c# create 2d barcode THE LIQUID NITROGEN OF SHAREPOINT in Font

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CHAPTER 8 THE LIQUID NITROGEN OF SHAREPOINT
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The difference is important. If you want to prevent an item from being added if certain criteria are not met, you need to use an ItemAdding event receiver and cancel the adding of the item. You would do so by setting properties.Cancel to true as such: public override void ItemAdding(SPItemEventProperties properties) { if (SomeCriteriaDoesNotMatch()) { properties.Cancel = true; } }
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Caution Although you could delete the item again in an ItemAdded event, doing so is messy. Consider
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what would happen if you have an automatically launched workflow that alerts users of a new item and the item itself is deleted right after the workflow is started.
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We will get back to how we actually attach our event receiver when we examine crafting content types.
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Content Type Authoring
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At this point, you should have enough information about how content types work to be able to understand the details of how content types are created. You already saw the programmatic method of adding a content type, and you will revisit that method in Part 3 of the book. At this point, we should explore using CAML in features to create content types. Let s start with a content type that is provided for us by SharePoint, the Document content type. Open the [12]\FEATURES\ctypes\ctypeswss.xml elements file, and scroll down past the System and Item content types until you reach the Document content type at around line 32.
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Check out the comments. These comments give a glimpse into SharePoint development thinking. Tip
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Figure 8-6 shows the XmlDocuments element closed. We will look at XmlDocuments more shortly.
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CHAPTER 8 THE LIQUID NITROGEN OF SHAREPOINT
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Figure 8-6. Document content type definition To add a content type using a feature, we would add a ContentType element to the elements.xml file of our feature. Then we would fill that ContentType element with all sorts of goodies, just like a Christmas stocking.
ContentType Element
The ContentType element has several attributes and child elements. The only required attributes are Name and ID. Name is the name you want to give your content type. ID is a unique string that defines not only content type inheritance, as you just learned, but also identifies each content type uniquely in a site collection. Getting the ID value right requires a bit of knowledge. You can craft your content type ID in two ways. You may start to see a pattern in the examples you have examined so far. Looking at the parent and child content type IDs, the inherited IDs of Item and Document added the number 01 to the parent type. Adding two numbers for example, 01, 02, or 99 is one way of inheriting from a parent type. If you wanted to inherit directly from Item, you could have your content type have an ID of 0x0102, 0x0193, and so on. The other method for crafting content type IDs is to add 00 and then a GUID string without the hyphens. For example, you may have an ID that inherits directly from Item as such: 0x01001A48C1A2B071432EACA85A0A35FF5185 Break that ID down, and you will see Item (0x01), two zeros (00), and a GUID. The Description attribute is rather simple. The text you add here is displayed below the name on the New button. If you look at Figure 8-7, you will see that the description for the Document content type is Create a new document in this library.
CHAPTER 8 THE LIQUID NITROGEN OF SHAREPOINT
Figure 8-7. Advanced settings of the content type settings Content types can optionally be arranged into groups. Most notably this is used in the Site Content Type Gallery. The Group attribute states under which subheading the content type should appear. The string value of Group is just an arbitrary value. You can enter whatever you like, and SharePoint will create a new group for you; or you can use an existing group name to group content types together.
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