winforms data matrix

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When adding an input parameter to a command object, you need to specify the parameter s name, data type, and value. The DbCommand object stores its parameters in a collection named Parameters, which contains DbParameter objects. Each DbParameter instance represents a parameter. Given that you have a DbCommand object named comm, the following code snippet creates a DbParameter object for the command using the CreateParameter method, sets its properties, and adds the parameter to the command s Parameters collection. // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentID"; param.Value = value; param.DbType = DbType.Int32; comm.Parameters.Add(param); The command s CreateParameter method always returns a parameter object type specific to the data provider you re using, so the DbParameter object will actually reference a SqlParameter instance if you re using SQL Server, and so on. Another important property of DbParameter is size, which is good to set for data types that don t have fixed values, such as VarChar. For numerical columns, specify the parameter size in bytes. For columns that store strings (such as Char, VarChar, or even Text), specify the size in number of characters. Longer strings are automatically truncated to the size specified for the parameter.

For design purposes, the simplest and base idea is the room itself, which can be defined as follows (in the controller library LibLightingSystem): public interface IRoom { } The interface does not have any methods or properties. It is called a placeholder interface. A placeholder type serves no other purpose than identifying that the implementation is of a certain type. Placeholder interfaces make it simpler to group objects that have certain capabilities. Imagine defining objects without a placeholder interface, something like this: class Type1 { } class Type2 { } Looking at Type1 and Type2, you cannot see any correlation between the two types; there is no way to say that Type1 and Type2 have some similar attribute. (Well, technically there is a correlation in that both types are derived from Object, but that type of correlation is like saying that all people are humans.) Using a placeholder interface, Type1 and Type2 can be correlated, as follows:

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Output stored procedure parameters behave like Out parameters in C#. They are much like return values, in that you set their value in the stored procedure and read it from the calling function after executing the procedure. Output parameters are especially useful when you have more return values, when you want to return non-integer data, or when you prefer to keep using the return value for indicating executing success (or for some other purpose). The code that creates an output parameter is as follows: // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@HowManyProducts"; param.Direction = ParameterDirection.Output; param.DbType = DbType.Int32; comm.Parameters.Add(param); This is almost the same as the code for the input parameter, except instead of supplying a value for the parameter, you set its Direction property to ParameterDirection.Output. This tells the command that @HowManyProducts is an output parameter.

class Type1 : IRoom { } class Type2 : IRoom { } ... IRoom[] rooms = new IRoom[ 10]; rooms[0] = new Type1(); rooms[1] = new Type2(); Having Type1 and Type2 implement the IRoom interface, which means do nothing other than subclass IRoom, establishes a correlation between Type1 and Type2. The correlation is that both Type1 and Type2 are rooms. We have no idea what kind of rooms, and we have no idea if the rooms are in the same building. We only know that they are rooms. The use of placeholder interfaces is very important in kernel design. Placeholders establish that a type wants to be part of a grouping. The kernel can use that grouping to define a list of elements that are all similar. It is like knowing the age of people to determine whether they are eligible to drive. The age does not indicate the sex or intelligence, nor if they are good or bad drivers. The age is a placeholder that says, Yes you are part of a grouping that is allowed to take a driving test to give you the right to drive. In the case of our lighting control, defining the IRoom placeholder interface is saying that whatever instance is associated with IRoom is indicating its interest in being part of the lighting controller kernel. When you have identified a type using a placeholder interface, you are saying your type can be used in a certain context. The context is determined by the placeholder interface.

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