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In the Enumerating Arrays section, I demonstrated the break keyword as a way to efficiently find the first element in an array that matches a given condition. The System.Array class contains some static methods that can simplify this process, as shown in Listing 13-21. Listing 13-21. Using the Find Method using System; class Listing 21 { static void Main(string[] args) { // define and populate an array string[] names = { "oranges", "apples", "guava", "peaches", "bananas", "grapes" }; // define the predicate Predicate<string> pred = new Predicate<string>(CheckString); // search for a match string match = Array.Find(names, pred); // print the result Console.WriteLine("Match: {0}", match); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); c# generate pdf417 Packages matching PDF417 - NuGet Gallery
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Using C# Micro PDF417 Generator to generate Micro PDF417 2D barcodes in C# .NET class, C# Asp.NET Web & Windows Forms. Download trial with tutorial for ... still shopping at the chain, the number of visits and spending per visit tend to grow. The chain spends $4.00 per year on direct-mail marketing messages, including seasonal specials. It loses money on women in the rst year, but overall it earns a good pro t from those who remain, so that the lifetime value of a newly acquired customer after 3 years is $111. The chain is doing well. Now we will determine the effect of additional email retention messages on a similar group of women, which we will call the test group. These women get 36 personalized email retention messages per year from the store, in addition to the regular direct mail. These messages cost $0.04 per message. They have the effect of increasing the retention rate by 5 percent, the number of visits per year by 0.2 visit, and the spending rate per visit by $5. Table 5-15 shows the results. As you can see, these retention messages have a dramatic effect on the women s behavior. Note that we could not have had this effect by simply increasing the number of direct-mail messages, which were costing us about $0.50 per message. Had we tried that, 36 messages per year would have cost us $18 per customer, or $3.6 million per year, which would have seriously eaten into pro ts. In addition, many of these email messages were quite timely and could not have been sent at all by direct pdf417 c# open source C# .NET PDF-417 Generator Control - Generate PDF417 Barcode in ...
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Rating 5.0 } static bool CheckString(string s) { return s.StartsWith("p"); } } The static System.Array.Find method takes the array in which you want to find a matching item and an instance of the System.Predicate<T> delegate, where T is the type that the array contains. The Predicate delegate is passed an object of type T and returns true if the object matches your search criteria. You can assign the delegate to a named method (as I have done in the example) or to an anonymous method or lambda expression. For example, I could have written the statement that calls the Find method like this: string match = Array.Find(names, s => s.StartsWith("p")); Obviously, the results depend upon your particular system. Here s what one particular run might look like: c# pdf417 generator Which free C# library can generate PDF-417 barcodes? - Stack Overflow
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Find out most popular NuGet pdf417 Packages. ... generation and recognition component, written in managed C# , it allows developers to quickly and easily add ... You can find full details of delegates in 10. The Find method returns the first object in the array that causes the predicate delegate to return true. Compiling and running the code in Listing 13-21 produces the following results: Match: peaches Press enter to finish A useful variation is the static Array.FindAll method that returns a new array containing only the items that satisfy the criteria in a predicate delegate. This can be an easy way to shrink an array and remove any null values, as demonstrated by Listing 13-22. Listing 13-22. Using the FindAll Method to Shrink an Array using System; class Listing 21 { static void Main(string[] args) { // define and populate an array including some null values string[] names = { "oranges", "apples", null, "guava", "peaches", null}; // shrink the array by finding all of the items which are not null string[] shrinkNames = Array.FindAll(names, s => s != null); // print out the details of the array Console.WriteLine("Array length: {0}", shrinkNames.Length); foreach (string s in shrinkNames) { Console.WriteLine("Item: {0}", s); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The code in the listing defines an array that has two null items, which we are going to remove. We call the static Array.FindAll method, which takes the array we want to work with and a System.Predicate delegate as parameters. The FindAll method returns an array containing only the items that cause the predicate delegate to return true. In this case, that s every item that it not null. Compiling and running the code in Listing 13-22 produces the following results: Array Item: Item: Item: Item: Press length: 4 oranges apples guava peaches enter to finish c# generate pdf417 micjahn/ZXing.Net: .Net port of the original java-based ... - GitHub
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