SmartDate should provide arithmetic manipulation of the date value. Since the goal is to emulate a regular DateTime data type, it should provide at least Add() and Subtract() methods: public DateTime Add(TimeSpan value) { if (IsEmpty) return this.Date; else return this.Date.Add(value); } public DateTime Subtract(TimeSpan value) { if (IsEmpty) return this.Date; else return this.Date.Subtract(value); } public TimeSpan Subtract(DateTime value) { if (IsEmpty) return TimeSpan.Zero; else return this.Date.Subtract(value); } Notice the special handling of empty SmartDate values. Adding or subtracting any value to an empty value results in an empty or zero value as appropriate. In any other case, the addition or subtraction is delegated to the actual underlying DateTime value in _date.
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To see this control in action, you would need to create a web service in addition to the ASP.NET page in which the AutoCompleteExtender will reside. But first, let s start with the page itself. Create an ASP.NET TextBox control on the page, followed by the ScriptManager and the AutoCompleteExtender control. After that, specify the parameters as shown here:
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Finally, we re getting to the floating-point calculations. For the right part of Figure 5-17, you find that X=14 corresponds to Y=38.67. In reality, almost all interpolations will result in a floating-point value, and this approach is up to this task.
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1. Technically arguments and variables don t actually hold the values, but instead tell the individual workflow how to access the values.
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The CslaDataSource class is the primary entry point at both design time and runtime. This is the object that a developer places on his web form when building a page. But really it is primarily a coordinator that connects all the pieces of the data source control together. This starts with the declaration of the class itself, in which a [Designer()] attribute is used to connect CslaDataSource to CslaDataSourceDesigner within Visual Studio: [Designer(typeof(Csla.Web.Design.CslaDataSourceDesigner))] [ToolboxData("<{0}:CslaDataSource runat=\"server\"></{0}:CslaDataSource>")] public class CslaDataSource : DataSourceControl { } Within the class itself, the code is largely concerned with providing the ASP.NET data binding infrastructure with a reference to the CslaDataSourceView object, and relaying events from the CslaDataSourceView back to the UI. Basically, CslaDataSource is merely a go-between at runtime, and a way of finding CslaDataSourceDesigner at design time. The only bit of functionality that a UI developer will see is that CslaDataSource declares and raises four events. The UI developer must respond to these events to provide the interaction with the business object. Table 5-7 lists the events. Table 5-7. Events Raised by the CslaDataSource Control
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For this to work, the object must be stateless. Any field-level information designed to be maintained across method calls will not necessarily be maintained. These types must be entirely autonomous at the method level. They need to accept all of the parameters required to do their work, do the work within the method call, and release any resources used to do the work before returning results to the caller. Pooling behavior is controlled with the ObjectPooling attribute, seen as follows. (You can find this class in the Serviced project of the Code07 solution.) [ObjectPooling(5, 500)] public class Poolable : ServicedComponent { public DataSet GetSomeData(string sql) { SqlConnection cn = new SqlConnection(ConnStr); SqlCommand cm = new SqlCommand(sql, cn); DataSet ds = new DataSet(); new SqlDataAdapter(cm).Fill(ds); return ds; } protected override CanBePooled() { return true; } } The ObjectPooling attribute controls the default configuration of the component when it s registered with COM+ (see Figure 7-6). As objects are deactivated, the COM+ runtime calls the CanBePooled method to verify that it has permission to return the instance to the pool. This method returns false from the base class, so you need to override it and return true in order to get instances into the pool. Pooling should always be used in combination with JITA, for highly available instances that are returned to the pool after each method completes. [ObjectPooling(5, 500)] [JustInTimeActivation(true)] public class Poolable : ServicedComponent { public DataSet GetSomeData(string sql) { SqlConnection cn = new SqlConnection(ConnStr); SqlCommand cm = new SqlCommand(sql, cn); DataSet ds = new DataSet(); cn.Open(); new SqlDataAdapter(cm).Fill(ds); cn.Close();
struct DMVertexToPixel { float4 Position : POSITION; float4 ScreenPos: TEXCOORD0; }; struct DMPixelToFrame { float4 Color : COLOR0; }; Next is your vertex shader, which produces a copy of the 2D coordinate of each vertex so the pixel shader can use it: DMVertexToPixel DMVertexShader(float4 inPos: POSITION0, float2 inTexCoord: TEXCOORD0) { DMVertexToPixel Output = (DMVertexToPixel)0; float4x4 preViewProjection = mul(viewMatrix, projectionMatrix); float4x4 preWorldViewProjection = mul(worldMatrix, preViewProjection); Output.Position = mul(inPos, preWorldViewProjection); Output.ScreenPos = Output.Position; return Output; } Your pixel shader maps the Z value of the pixel to a grayscale color: DMPixelToFrame DMPixelShader(DMVertexToPixel PSIn) : COLOR0 { DMPixelToFrame Output = (DMPixelToFrame)0; Output.Color = PSIn.ScreenPos.z/PSIn.ScreenPos.w; return Output; } And of course here is the technique definition: technique DepthMap { pass Pass0 { VertexShader = compile vs_1_1 DMVertexShader(); PixelShader = compile ps_2_0 DMPixelShader(); } }
As you can see, each of the specifications is encapsulated within the SOAP header, and each supports distinctive element tags so that no specification information can conflict. Web service composability is essential for allowing developers to choose which specifications are important for their Web services. In addition, this feature keeps message payloads smaller in size by not including element tags for unused specifications.
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