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Pure C++: Generic Programming: Template Specialization

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

As I discussed in my last column, a param-eterized type that does more than simple storage and retrieval is constrained as to the acceptable types that may be safely bound to it (see Pure C++: CLR Generics Versus C++ Templates.

Stanley B. Lippman

MSDN Magazine August 2005

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Visual Studio® 2005 brings the type parameter model of generic programming to the Microsoft® . NET Framework. Parameterized types are, of course, standard fare for C++ programmers. So, for those who are unfamiliar with them, I'll give a brief introduction to generic programming in my next few columns.

Stanley B. Lippman

MSDN Magazine April 2005

Pure C++: Reflecting on Generic Types


A funny thing happened to templates on their way to the common language runtime (CLR)-they lost their {type} identity. This is analogous to what happens with macros under native programs. Just as the C/C++ compilers have no awareness of macro preprocessor expansions, the CLR has no awareness of template instantiations.

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public class User
		public List<Company> Companies;
		public string Login { get; set; }

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		public string FirstName { get; set; }

		[DisplayName("Last Name")]
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		public string Password { get; set; }

		private int Company { get; set; }

And the following generic control template writer (which would have to be extended appropriately)

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<% foreach (var prop in ViewData.ModelMetadata.Properties .Where(pm => pm.ShowForEdit && !ViewData.TemplateInfo.Visited(pm))) 
{ %>
	<div class="SD_FieldItem">
		<% if (!String.IsNullOrEmpty(Html.Label(prop.PropertyName).ToHtmlString()))
			switch (prop.ModelType.Name)
				case "Boolean":

						<div class="SD_BoolField">
							<%= Html.CheckBox(prop.PropertyName) %>
							<%= Html.Label(prop.PropertyName) %>
							<%= Html.ValidationMessage(prop.PropertyName, 

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Any suggestions?

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I have a generic list of a custom type. The custom type has a string and double.

I'm binding the list to a gridview and it outputs everything fine.

I'm trying to format the double column into a currency format. It is in a template field as I'm calculating a running total. I pass the value to a function that returns a double and adds the current value to a running total which I will show in the footer.

The format is not changing to currency as expected when using String.Format("{0:c}", GetTotal(Convert.ToDouble(Eval("Amount"))))

Any ideas on what might be going on and how to fix this?


Need Syntax To Make Results of LINQ Union Return Non-Generic Type



I have the below SQL which works just fine:

SELECT     Message, CreateDate, AccountId, AlertTypeId
FROM       dbo.Alerts
SELECT     TOP (100) PERCENT Status, CreateDate, AccountId,
                          (SELECT     10 AS Expr1) AS AlertTypeId
FROM         dbo.StatusUpdates
WHERE AccountId = PassedInParameter

I have been going about trying to convert the above into a LINQ method and am having problems with return types.
As the above SQL illustrates, I am querying two distinct LINQ tables - Alerts and StatusUpdates -
and then attempting to perform a Union on them. In order to do the union in LINQ, I have to have agreeing types. So, I
am using "var" to make the results of "alerts" and "updates" generic before the union.  

public IList GetStatusUpdatesAsAlertsByAccountId<T>(Int32 accountId)
            using (WorkbookDataContext dc = _conn.GetCont

A generic error occurred in GDI+.



I'm getting this error on the yellow screen and I have no idea what to do with it, or where to start:

[ExternalException (0x80004005): A generic error occurred in GDI+.]
System.Drawing.Image.Save(String filename, ImageCodecInfo encoder, EncoderParameters encoderParams) +377630
NopSolutions.NopCommerce.BusinessLogic.Media.PictureManager.GetPictureUrl(Picture picture, Int32 targetSize, Boolean showDefaultPicture) in F:\Temp\Test\nopCommerce 1.60\Libraries\Nop.BusinessLogic\Media\PictureManager.cs:396
NopSolutions.NopCommerce.BusinessLogic.Media.PictureManager.GetPictureUrl(Picture picture, Int32 targetSize) in F:\Temp\Test\nopCommerce 1.60\Libraries\Nop.BusinessLogic\Media\PictureManager.cs:180
NopSolutions.NopCommerce.Web.Administration.Modules.CategoryInfoControl.BindData() in F:\Temp\Test\nopCommerce 1.60\NopCommerceStore\Administration\Modules\CategoryInfo.ascx.cs:63
NopSolutions.NopCommerce.Web.Administration.Modules.CategoryInfoControl.Page_Load(Object sender, EventArgs e) in F:\Temp\Test\nopCommerce 1.60\NopCommerceStore\Administration\Modules\CategoryInfo.ascx.cs:99
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
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