مسعود مشهدی مسعود مشهدی
نظرات مطالب
سیلورلایت 5 و تاریخ شمسی
سلام جناب نصیری
من تو پروژه سیلور از OData استفاده کردم. وقتی می خواستم Max یک ستون رو برگردونم با پیغام زیر مواجه شدم.
.NotSupportedException: The method 'Max' is not supported
ظاهرا بعضی از متدها موقع کوئری نوشتن (LINQ to Entities) با OData و WCF سازگار نیستن و ساپورت نمیشوند.(البته تا جایی که من سرچ کردم و یه چیزایی فهمیدم).
This topic provides information about the way in which LINQ queries are composed and executed when you are using the WCF Data Services client and limitations of using LINQ to query a data service that implements the Open Data Protocol (OData). For more information about composing and executing queries against an OData-based data service, see Querying the Data Service (WCF Data Services).
Composing LINQ Queries
LINQ enables you to compose queries against a collection of objects that implements IEnumerable. Both the Add Service Reference dialog box in Visual Studio and the DataSvcUtil.exe tool are used to generate a representation of an OData service as an entity container class that inherits from DataServiceContext, as well as objects that represent the entities returned in feeds. These tools also generate properties on the entity container class for the collections that are exposed as feeds by the service. Each of these properties of the class that encapsulates the data service return a DataServiceQuery. Because the DataServiceQuery class implements the IQueryable interface defined by LINQ, the WCF Data Services you can compose a LINQ query against feeds exposed by the data service, which are translated by the client library into a query request URI that is sent to the data service on execution.
 Note:
The set of queries expressible in the LINQ syntax is broader than those enabled in the URI syntax that is used by OData data services. A NotSupportedException is raised when the query cannot be mapped to a URI in the target data service. For more information, see the Unsupported LINQ Methods in this topic.
لطفا اگر امکانش هست راهنمائی بفرمائید و اینکه حالا که ساپورت نمیشه چه راه حلی وجود داره برای Max گرفتن.
با تشکر

‫۱۲ سال و ۵ ماه قبل، دوشنبه ۲۹ خرداد ۱۳۹۱، ساعت ۰۴:۵۰
وحید نصیری وحید نصیری
اشتراک‌ها
برنامه ریزی برای EF Core 6.0

JSON columns

  • Introduce common patterns for JSON support that can be implemented by any database provider.
  • JSON column support will be implemented for SQL Server and SQLite. (Note that the PostgreSQL and MySQL providers already support JSON columns.) 
برنامه ریزی برای EF Core 6.0
‫۳ سال و ۸ ماه قبل، جمعه ۲۶ دی ۱۳۹۹، ساعت ۱۲:۵۰
وحید نصیری وحید نصیری
اشتراک‌ها
سایت SQL مدرن

Since 1999, SQL is not limited to the relational model anymore.
Back then ISO/IEC 9075 (the “SQL standard”) added arrays, objects and recursive queries. In the meanwhile the SQL standard has grown five times bigger than SQL-92. In other words: relational SQL is only about 20% of modern SQL.0 

سایت SQL مدرن
‫۱ سال قبل، شنبه ۸ مهر ۱۴۰۲، ساعت ۱۱:۲۴
وحید محمدطاهری وحید محمدطاهری
اشتراک‌ها
Visual Studio 2017 15.7 منتشر شد
Visual Studio 2017 15.7 منتشر شد
‫۶ سال و ۵ ماه قبل، سه‌شنبه ۱۸ اردیبهشت ۱۳۹۷، ساعت ۰۴:۱۵
محمد جواد ابراهیمی محمد جواد ابراهیمی
اشتراک‌ها
اضافه شدن قابلیت Package Registry به Github

Today, we’re excited to introduce GitHub Package Registry, a package management service that makes it easy to publish public or private packages next to your source code.

GitHub Package Registry is fully integrated with GitHub, so you can use the same search, browsing, and management tools to find and publish packages as you do for your repositories. You can also use the same user and team permissions to manage code and packages together. GitHub Package Registry provides fast, reliable downloads backed by GitHub’s global CDN. And it supports familiar package management tools: JavaScript (npm), Java (Maven), Ruby (RubyGems), .NET (NuGet), and Docker images, with more to come.

اضافه شدن قابلیت Package Registry به Github
‫۵ سال و ۵ ماه قبل، شنبه ۲۱ اردیبهشت ۱۳۹۸، ساعت ۱۰:۱۴