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The following list indicates some of the things to address: Resource and Employee could be duplicates. It isn t clear that Resource adds anything to Employee, so the two can probably be merged into one class. Based on the use case description, we know that RoleList is a name/value list, which directly implies the Role is just a name/value placeholder. Given Csla.NameValueListBase, this can be simplified. The relationship between Project, ProjectResources, Resource, and ResourceAssignments is very complex. In fact, it forms a loop of references, which is always a danger sign. The RoleList object isn t used by any other objects in the model. Given that the use cases indicate that resources are assigned to projects based on a specific role, this is suspicious. The use cases for ProjectList and ResourceList indicate that they re primarily used for selection of objects, not for editing all the projects or resources in the system. Actually loading all the Project or Resource objects just so that the user can make a simple selection is expensive, performance-wise, so this design should be reviewed. It is clear that when the list of roles is edited, any RoleList objects need to know about the changes so they can read the new data. This is not explicitly stated in a use case, but is an inferred requirement. In the early stages of any object design process there will be duplicate objects, or potential objects that end up being mere data fields in other objects. Usually, a great deal of debate will ensue
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Floating point, single precision Floating point, double precision 8-byte signed integer 4-byte signed integer 2-byte signed integer 1-byte signed integer Sequence of two-digit hexadecimal numbers, without the 0x prefix Composite quoted string
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Figure 15-8. When the delegate is invoked, it invokes each of the methods in its invocation list, with the same parameters with which it was called. A method can be in the invocation list more than once. If that is the case, then when the delegate is invoked, the method will be called each time it is encountered in the list.
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Action and Func delegates now can accept up to 16 generic parameters, which might result in unreadable code. This reminds me of an API that a health care provider (who shall remain nameless) gave me that had a method with more than 70 ( !) parameters.
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Listing 19-3 demonstrates using these methods to add, obtain, and remove items. These methods exist in addition to those of the IList<T> and ICollection<T> interfaces, so you can still use the Add and Insert methods and get and set values using the indexer, for example.
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private void WhileCondition(object sender, ConditionalEventArgs e) { e.Result = IntCounter < 10; IntCounter++; } Add a Code activity and write to the console the value of IntCounter each time the Code activity is executed. Add a breakpoint to the While activity and debug the application. The console shows each increment of the variable until 10.
IsNumeric CallByName GetPropertyType GetChildItemType CoerceValue
The multiplication operator (*) is used in Listing 4-1 to calculate the product of two numeric values multiplying 10 by 10. The assignment operator (=) sets the value of the local variable called x to the result of the multiplication operation. The C# operators are described at the end of this chapter, and examples for each are provided. One of the most important C# operators is the one that your eye may have passed over in Figure 4-4 the dot operator (.). This operator is used for member access specify a type, member, or namespace (these terms are described later in this chapter and in 11). The dot operator joins different elements of your program together to create a chain that the C# runtime can follow to carry out an action defined in your code statement. In Listing 4-1, the dot operator combines the name of a class (Console) with the name of a method (WriteLine); this is an instruction to perform the action defined in that method, which is part of the specified class.
Deleting a Pivot Chart on a Worksheet If you no longer need a pivot chart that s on a worksheet, you can delete it. 1. Select the pivot chart. 2. On the keyboard, press the Delete key. Deleting a Pivot Chart on a Chart Sheet If you no longer need a pivot chart that s on a chart sheet, you can delete it. 1. Right-click the sheet tab for the chart sheet, and then click Delete. 2. In the confirmation message, click Delete. Clearing a Pivot Chart If you want to start from scratch with a pivot chart layout, you can clear it. 1. Select the pivot chart. 2. On the Ribbon, under the PivotChart Tools tab, click the Analyze tab. 3. In the Data section, click the Clear command, and then click Clear All. This leaves the pivot chart frame on the worksheet, but it removes all the fields from the pivot chart and pivot table. To rebuild the chart, use the PivotTable Field List.
class Listing 04 { static void Main(string[] args) { ConnectionStringSettings connStringSettings = ConfigurationManager.ConnectionStrings["NorthwindConnection"]; // create the connection object SqlConnection myConnection = new SqlConnection(connStringSettings.ConnectionString); // create a SQL command object SqlCommand myCommand = myConnection.CreateCommand(); myCommand.CommandText = "SELECT * FROM Employees WHERE City='London'"; // open the connection to the database myConnection.Open(); // execute the command SqlDataReader myReader = myCommand.ExecuteReader(); // process the data while (myReader.Read()) { // get the fields for this current row string firstName = (string) myReader["FirstName"]; string lastName = (string) myReader["LastName"]; string city = (string) myReader["City"]; // print out the information for this record Console.WriteLine("Name: {0} {1}, City: {2}", firstName, lastName, city); } // close the database connection myConnection.Close(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } }
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