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There should be two </CodeGroup> tags below the code group that you added for this data extension. Be sure to place the new code group correctly in this file.

defined by this collection. In particular, this problem makes cascade saves (discussed later in this chapter) useless for sets. We strongly discourage this solution (database identifier equality). You could fix this problem by assigning an identifier yourself at the creation of the entities and using versioning to distinguish transient and detached instances.

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There is an open source project called QRCode. QRCode library is a .NET component that can be used to encode and decode QRCode.

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A better way is to include all persistent properties of the persistent class, apart from any database identifier property, in the Equals() comparison. This is how most people perceive the meaning of Equals(); we call it by value equality. When we say all properties, we don t mean to include collections. Collection state is associated with a different table, so it seems wrong to include it. More important, you don t want to force the entire object graph to be retrieved just to perform Equals(). In the case of User, this means you shouldn t include the items collection (the items sold by this user) in the comparison. Here is the implementation you could use:

12. Save and close the file. In this procedure, you ll test the deployment of the custom data processing extension in Report Designer.

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Just call function. Also, replace ... with your handling public Result decode(Uri uri​) { Bitmap image; try { image = (Bitmap) Bitmap.FromFile(uri.

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public class User { //... public override bool Equals(object other) { if (object.ReferenceEquals(this,other)) return true; if ( !(other is User) ) return false; User that = (User) other; if ( ! this.Username == that.Username ) return false; if ( ! this.Password == that.Password ) return false; return true; } public override int GetHashCode() { int result = 14; result = 29 * result + Username.GetHashCode(); result = 29 * result + Password.GetHashCode(); return result; } }

But again, this approach has two problems:

Instances from different sessions are no longer equal if one is modified (for example, if the user changes his password). Instances with different database identity (instances that represent different rows of the database table) can be considered equal, unless some combination of properties is guaranteed to be unique (the database columns have a unique constraint). In the case of User, there is a unique property: Username.

16:

A business key is a property, or some combination of properties, that is unique for each instance with the same database identity. Essentially, it s the natural key you d use if you

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weren t using a surrogate key. Unlike a natural primary key, it isn t an absolute requirement that the business key never change as long as it changes rarely, that s enough. We argue that every entity should have a business key, even if it includes all properties of the class (this would be appropriate for some immutable classes). The business key is what the user thinks of as uniquely identifying a particular record, whereas the surrogate key is what the application and database use. Business key equality means that the Equals() method compares only the properties that form the business key. This is a perfect solution that avoids all the problems described earlier. The only downside is that it requires extra thought to identify the correct business key in the first place. But this effort is required anyway; it s important to identify any unique keys if you want your database to help ensure data integrity via constraint checking. For the User class, username is a great candidate business key. It s never null, it s unique, and it changes rarely (if ever):

public class User { //... public override bool Equals(object other) { if (object.ReferenceEquals(this,other)) return true; if ( !(other is User) ) return false; User that = (User) other; return this.Username == that.Username ); } public override int GetHashCode() { return Username.GetHashCode(); } }

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