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Figure 10-13. Bezier curve describing the acceleration and deceleration of the car A Bezier curve is what the spline interpolation process uses to describe the varying rate of change. Keep in mind this curve describes the values of the property over time. Bezier curves were briefly mentioned in 9, but let s take a closer look at how they work so it s clear how spline interpolation can be used. The type of Bezier curve used by spline interpolation is a cubic Bezier with two control points, so the cubic Bezier curve is defined by four points, including the endpoints. If P1 and P4 are the endpoints, and P2 and P3 are the control points, the Bezier curve is a line that connects P1 to P4 but is pulled toward P2 and P3 in order to create the curve. The control points are not necessarily touched by the curve. If you set P2 and P3 to points along the line from P1 to P4, such as setting them to (0.25,0.25) and (0.75,0.75), the Bezier curve is a straight line and the animation is effectively using linear interpolation.
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{ // types match, just copy value propertyInfo.SetValue(target, value, null); } else { // types don't match, try to coerce if (pType.Equals(typeof(Guid))) propertyInfo.SetValue( target, new Guid(value.ToString()), null); else propertyInfo.SetValue( target, Convert.ChangeType(value, pType), null); } } } Reflection is used to retrieve a PropertyInfo object corresponding to the specified property on the target object. The specific type of the property s return value is retrieved using a GetPropertyType() helper method in the Utilities class. That helper method exists to deal with the possibility that the property could return a value of type Nullable<T>. If that happens, the real underlying data type (behind the Nullable<T> type) must be returned. Here s the GetPropertyType() method: public static Type GetPropertyType(Type propertyType) { Type type = propertyType; if (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(Nullable))) return type.GetGenericArguments()[0]; return type; } If Nullable<T> isn t involved, then the original type passed as a parameter is simply returned. But if Nullable<T> is involved, then the first generic argument (the value of T) is returned instead: return type.GetGenericArguments()[0]; This ensures that the actual data type of the property is used rather than Nullable<T>. Back in the SetValue() method, the PropertyInfo object has a SetValue() method that sets the value of the property, but it requires that the new value have the same data type as the property itself. Given that the values from an IDictionary collection or DTO may not exactly match the property types on a business object, DataMapper.SetValue() attempts to coerce the original type to the property type before setting the property on the target object. To do this, it retrieves the type of the target property. If the new value is not null, then the type of the new value is compared to the type of the property to see if they match: if (pType.Equals(value.GetType())) { // types match, just copy value propertyInfo.SetValue(target, value, null); } If they do match, then the property is set to the new value. If they don t match, then there s an attempt to coerce the new value to the same type as the property:
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The site needs to provide some basic configuration information through the web.config file. This includes configuring the data portal or database connection strings. It also includes configuring the CslaDataSource control. In the web.config file, you can either provide connection strings so that the site can interact with the database directly, or you can configure the data portal to communicate with a remote application server. The basic concept here was discussed in 4 when the channel adapter implementation was covered. Recall that the data portal supports three possible channels: remoting, Enterprise Services, and Web Services. You can create your own channels as well if none of these meet your needs. In 1, I discussed the trade-offs between performance, scalability, fault tolerance, and security that come with various physical n-tier configurations. In most cases, the optimal solution for a web UI is to run the data portal locally in the client process. However, for security reasons, it may be desirable to run the data portal remotely on an application server. 12 will demonstrate how to create the three types of remote data portal hosts for use by the PTWeb application. The web.config file is an XML file that contains settings to configure the website. You use different XML depending on how you want the site configured.
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{ Command.Parameters.Add( string.Format("@{0}", parameterRoot.Parameter.Name), SqlDbType.Int, 4).Value = Convert.ToInt32(parameterRoot.Parameter.Value); } else if (parameterRoot.Parameter.Type.ToUpper().StartsWith("UNIQUE")) { Command.Parameters.Add( string.Format("@{0}", parameterRoot.Parameter.Name), SqlDbType.UniqueIdentifier, 32).Value = new Guid(parameterRoot.Parameter.Value); } else if (parameterRoot.Parameter.Type.ToUpper().StartsWith("XML")) { Command.Parameters.Add( string.Format("@{0}", parameterRoot.Parameter.Name), SqlDbType.Xml, 0).Value = parameterRoot.Parameter.Value; } else if (parameterRoot.Parameter.Type.ToUpper().StartsWith("TIMSTAMP")) { Command.Parameters.Add( string.Format("@{0}", parameterRoot.Parameter.Name), SqlDbType.Timestamp, 0).Value = parameterRoot.Parameter.Value; } else if (parameterRoot.Parameter.Type.ToUpper().StartsWith("DATETIME")) { DateTime dt = DateTime.Now; if (parameterRoot.Parameter.Value != string.Empty) { dt = DateTime.Parse(parameterRoot.Parameter.Value); } Command.Parameters.Add( string.Format("@{0}", parameterRoot.Parameter.Name), SqlDbType.DateTime, 0).Value = dt; } } } finally { if (null != Command) { Command.Dispose(); } } return output; } private bool _PopulateStoredProcedureParameters(ref StoredProcedure storedProcedure,
The PropFlags entry must contain 0 or a combination of the binary flags specialname (0x0200), rtspecialname (0x0400), and 0x1000. If the rtspecialname flag is set, the specialname flag must also be set. If the 0x1000 flag is set, the Constant table must contain a valid record whose Parent entry holds the reference to this Property record, and vice versa. The Name entry must contain a valid offset in the #Strings stream, indexing a string no longer than 1,023 bytes in UTF-8 encoding. If the specialname and rtspecialname flags are set, the property name must be _Deleted*. No duplicate records those with the same name and signature belonging to the same class can exist unless the property name is _Deleted*. The Type entry must contain a valid offset in the #Blob stream, indexing a valid property signature. 7 discussed the validity rules for property signatures.
// T must have a public default constructor and // T must inherit from C and // T must implement I. generic <class T> where T : gcnew(), C, I void F(T t) { // ... } interface class IKey; // Use multiple where clauses to specify // constraints for multiple type parameters. generic <typename Key, typename Value> where Key : IKey where Value : value class ref class Dictionary { // ... }; The Dictionary class requires keys to implement IKey and the values to be value types. The .NET Framework BCL Dictionary class doesn t have these restrictions. You ll learn more about the ArrayList and Dictionary collection classes in the next section.
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