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c# pdf 417 reader

Packages matching Tags:"PDF417" - NuGet Gallery
57 packages returned for Tags:"PDF417" ... Atalasoft DotImage barcode reader (32-bit) ... The PDF417 barcode encoder class library is written in C#. It is open ...

c# pdf 417 reader

Packages matching PDF417 - NuGet Gallery
ZXing.Net Win PDF417 barcode library for Windows (UWP) ... The PDF417 barcode encoder class library is written in C#. It is open ... PDF 417 Barcode Decoder.

If you join the tables ITEM and BID with an inner join, using their common attributes (the ITEM_ID column), you get all items and their bids in a new result table. Note that the result of this operation contains only items that have bids. If you want all items, and null values instead of bid data when there is no corresponding bid, you use a (left) outer join, as shown in figure 7.3. You can think of a table join as working in this way: First, you get a Cartesian product of the two tables by taking all possible combinations of ITEM rows with BID rows. Second, you filter these joined rows using a join condition. Note that the database has much more sophisticated algorithms to evaluate a join; it usually doesn t build a memory-consuming product and then filter all rows. The join condition is a Boolean expression that evaluates to true if the joined row is to be included in the result. In the case of the left outer join, each row in the (left) ITEM table that never satisfies the join condition is also included in the result, with null values returned for all columns of BID. (A right outer join retrieves all bids and null if a bid has no item certainly not a sensible query in this situation.) In SQL, the join condition is usually specified explicitly; it isn t possible to use the name of a foreign-key constraint to specify how two tables are to be joined. Instead, you have to specify the join condition in the on clause for an ANSI-style join or in the where clause for a so-called theta-style join, where I.ITEM_ID = B.ITEM_ID.

c# pdf 417 reader

C# PDF-417 Reader SDK to read, scan PDF-417 in C#.NET class ...
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c# pdf 417 reader

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Equals() on each object you put in the ISet, to determine (and prevent) dupli-

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c# pdf 417 reader

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c# pdf 417 reader

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cate elements. First let s consider the default implementation of Equals(), defined by System. Object, which uses a comparison by .NET identity. NHibernate guarantees that there is a unique instance for each row of the database inside an ISession. Therefore, the default identity Equals() is appropriate if you never mix instances that is, if you never put detached instances from different sessions into the same ISet. (The issue we re exploring is also visible if detached instances are from the same session but have been serialized and deserialized in different scopes.) But as soon as you have instances from multiple sessions, it becomes possible to have an ISet containing two Items that each represent the same row of the database table but don t have the same .NET identity. This would almost always be semantically wrong. Nevertheless, it s possible to build a complex application using the built-in identity equality, as long as you exercise discipline when dealing with detached objects from different sessions (and keep an eye on serialization and deserialization). One nice thing about this approach is that you don t have to write extra code to implement your own notion of equality. If this concept of equality isn t what you want, you have to override Equals() in your persistent classes. Keep in mind that when you override Equals(), you must always also override GetHashCode() so the two methods are consistent (if two objects are equal, they must have the same hash code). Let s look at some of the ways you can override Equals() and GetHashCode() in persistent classes.

c# pdf 417 reader

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c# pdf 417 reader

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A seemingly clever approach is to implement Equals() to compare just the database identifier property (usually a surrogate primary key) value:

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

Notice how this Equals() method falls back to .NET identity for transient instances (if id==null) that don t have a database identifier value assigned yet. This is reasonable, because they can t have the same persistent identity as another instance. Unfortunately, this solution has one huge problem: NHibernate doesn t assign identifier values until an entity is saved. If the object is added to an ISet before being saved, its hash code changes while it s contained by the ISet, contrary to the contract

c# pdf 417 reader

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c# pdf 417 reader

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NET PDF-417 Barcode Reader, Reading PDF-417 barcode images in .NET, C#, VB.NET, ASP.NET applications.

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c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader

c# pdf 417 reader