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Generator QR-Code in Visual C# LINQ

LINQ
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var inStockList = from item in items join entry in statusList on itemItemNumber equals entryItemNumber select new Temp(itemName, entryInStock);
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PART I PART I PART I
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This query produces a sequence that contains objects that encapsulate the name and the instock status of an inventory item This information is synthesized from joining the two lists items and statusList The following version reworks this query so that it uses the Join( ) method rather than the C# query syntax:
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// Use Join() to produce a list of item names and status var inStockList = itemsJoin(statusList, k1 => k1ItemNumber, k2 => k2ItemNumber, (k1, k2) => new Temp(k1Name, k2InStock) );
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Although this version uses the named class called Temp to hold the resulting object, an anonymous type could have been used instead This approach is shown next:
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var inStockList = itemsJoin(statusList, k1 => k1ItemNumber, k2 => k2ItemNumber, (k1, k2) => new { k1Name, k2InStock} );
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Query Syntax vs Query Methods
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As the preceding section has explained, C# has two ways of creating queries: the query syntax and the query methods What is interesting, and not readily apparent by simply looking at a program s source code, is that the two approaches are more closely related than you might at first assume The reason is that the query syntax is compiled into calls to the query methods Thus, when you write something like
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where x < 10
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the compiler translates it into
Where(x => x < 10)
Therefore, the two approaches to creating a query ultimately lead to the same place Given that the two approaches are ultimately equivalent, the following question naturally arises: Which approach is best for a C# program The answer: In general, you will want to use the query syntax It is fully integrated into the C# language, supported by keywords and syntax, and is cleaner
More Query-Related Extension Methods
In addition to the methods that correspond to the query keywords supported by C#, the NET Framework provides several other query-related extension methods that are often helpful in a query These query-related methods are defined for IEnumerable<T> by Enumerable Here is a sampling of several commonly used methods Because many of the methods are overloaded, only their general form is shown
Part I:
The C# Language
Method All(condition) Any(condition) Average( ) Contains(obj) Count( ) First( ) Last( ) Max( ) Min( ) Sum( )
Description Returns true if all elements in a sequence satisfy a specified condition Returns true if any element in a sequence satisfies a specified condition Returns the average of the values in a numeric sequence Returns true if the sequence contains the specified object Returns the length of a sequence This is the number of elements that it contains Returns the first element in a sequence Returns the last element in a sequence Returns the maximum value in a sequence Returns the minimum value in a sequence Returns the summation of the values in a numeric sequence
You have already seen Count( ) in action earlier in this chapter Here is a program that demonstrates the others:
// Use several of the extension methods defined by Enumerable using System; using SystemLinq; class ExtMethods { static void Main() { int[] nums = { 3, 1, 2, 5, 4 };
ConsoleWriteLine("The minimum value is " + numsMin()); ConsoleWriteLine("The maximum value is " + numsMax()); ConsoleWriteLine("The first value is " + numsFirst()); ConsoleWriteLine("The last value is " + numsLast()); ConsoleWriteLine("The sum is " + numsSum()); ConsoleWriteLine("The average is " + numsAverage()); if(numsAll(n => n > 0)) ConsoleWriteLine("All values are greater than zero"); if(numsAny(n => (n % 2) == 0)) ConsoleWriteLine("At least one value is even"); if(numsContains(3)) ConsoleWriteLine("The array contains 3"); } }
The output is shown here:
19:
LINQ
The minimum value is 1 The maximum value is 5 The first value is 3 The last value is 4 The sum is 15 The average is 3 All values are greater than zero At least one value is even The array contains 3
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