Hopefully the era of leprosy and corona is over for this time and it’s time to get back to blogging. Exceptions are powerful feature of object-oriented languages as far as they are used like they are thought to use – throw exception only when something really unexpected happens
These are the issues addressed in 15.9.15:
Tune in online on December 4, 2018 for a full day of dev-focused delight—including updates on Azure and Visual Studio, keynotes, demos, and real-time coding with experts—live from the Microsoft Azure and AI Conference.
The dynamic keyword acts as a static type declaration in the C# type system. This way C# got the dynamic features and at the same time remained a statically typed language.
http://msdn.microsoft.com/en-us/magazine/gg598922.aspx
New In-Memory OLTP improvements in CTP3.1 include:
Syntax inputdate AT TIME ZONE timezone.
SQL Server Analysis Services (SSAS) updates allow upgrading your existing models to 1200 compatibility level and a JSON editor for SSDT;
Web-based applications run smoother if instead of using the traditional form method, they use JavaScript to post data to the server and to update the user interface after posting data: It also makes it easier to keep POST and GET actions separated. SignalR makes it even slicker; it can even update multiple pages at the same time. Is it time to use JavaScript to post data rather than posting via the browser the traditional way?
using System.Diagnostics.CodeAnalysis;
namespace CS11Tests;
public class StringSyntaxAttributeTests
{
public static void Test()
{
RegexTest("");
DateTest("");
}
private static void RegexTest([StringSyntax(StringSyntaxAttribute.Regex)] string regex)
{
}
private static void DateTest([StringSyntax(StringSyntaxAttribute.DateTimeFormat)] string dateTime)
{
}
} 
#if !NET7_0_OR_GREATER
namespace System.Diagnostics.CodeAnalysis
{
/// <summary>Specifies the syntax used in a string.</summary>
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false, Inherited = false)]
public sealed class StringSyntaxAttribute : Attribute
{
/// <summary>The syntax identifier for strings containing composite formats for string formatting.</summary>
public const string CompositeFormat = "CompositeFormat";
/// <summary>The syntax identifier for strings containing date format specifiers.</summary>
public const string DateOnlyFormat = "DateOnlyFormat";
/// <summary>The syntax identifier for strings containing date and time format specifiers.</summary>
public const string DateTimeFormat = "DateTimeFormat";
/// <summary>The syntax identifier for strings containing <see cref="T:System.Enum" /> format specifiers.</summary>
public const string EnumFormat = "EnumFormat";
/// <summary>The syntax identifier for strings containing <see cref="T:System.Guid" /> format specifiers.</summary>
public const string GuidFormat = "GuidFormat";
/// <summary>The syntax identifier for strings containing JavaScript Object Notation (JSON).</summary>
public const string Json = "Json";
/// <summary>The syntax identifier for strings containing numeric format specifiers.</summary>
public const string NumericFormat = "NumericFormat";
/// <summary>The syntax identifier for strings containing regular expressions.</summary>
public const string Regex = "Regex";
/// <summary>The syntax identifier for strings containing time format specifiers.</summary>
public const string TimeOnlyFormat = "TimeOnlyFormat";
/// <summary>The syntax identifier for strings containing <see cref="T:System.TimeSpan" /> format specifiers.</summary>
public const string TimeSpanFormat = "TimeSpanFormat";
/// <summary>The syntax identifier for strings containing URIs.</summary>
public const string Uri = "Uri";
/// <summary>The syntax identifier for strings containing XML.</summary>
public const string Xml = "Xml";
/// <summary>Initializes the <see cref="T:System.Diagnostics.CodeAnalysis.StringSyntaxAttribute" /> with the identifier of the syntax used.</summary>
/// <param name="syntax">The syntax identifier.</param>
public StringSyntaxAttribute(string syntax)
{
this.Syntax = syntax;
this.Arguments = Array.Empty<object>();
}
/// <summary>Initializes the <see cref="T:System.Diagnostics.CodeAnalysis.StringSyntaxAttribute" /> with the identifier of the syntax used.</summary>
/// <param name="syntax">The syntax identifier.</param>
/// <param name="arguments">Optional arguments associated with the specific syntax employed.</param>
public StringSyntaxAttribute(string syntax, params object?[] arguments)
{
this.Syntax = syntax;
this.Arguments = arguments;
}
/// <summary>Gets the identifier of the syntax used.</summary>
public string Syntax { get; }
/// <summary>Gets the optional arguments associated with the specific syntax employed.</summary>
public object?[] Arguments { get; }
}
}
#endif using System;
using System.Linq;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
// این قسمت برای ورود اطلاعات به بانک است و با کمک کتابخانه پرژن دات نت تاریخ شمسی را به میلادی تبدیل و ذخیره میکنم
using(var db = new h7Entities())
{
var t = new test
{
ResponseDate = PersianDateTime.Parse(textBox1.Text).ToDateTime()
};
db.test.Add(t);
db.SaveChanges();
}
}
private void Form1_Load(object sender, EventArgs e)
{
// این قسمت هم فقط اطلاعات واکشی شده را در گرید نمایش میدهد . بدون هیچ شرطی ، یک سلکت ساده . . فقط از پرژن دانت نت برای تبدیل میلادی به شمسی کمک میگیرم
using (var db = new h7Entities())
{
dataGridView1.DataSource =(from t in db.test
select new
{
Id= t.Id,
time = new PersianDateTime(DateTime.Parse(t.ResponseDate.ToString())).ToString(PersianDateTimeFormat.DateShortTime)
}).ToList();
}
}
}
} public partial class test
{
public int Id { get; set; }
public Nullable<System.DateTime> ResponseDate { get; set; }
} 
