If Not a And b Then ... Else ... EndIf
if(!(a) && b)
{
...
}
else
{
} public interface ICommand
{
}
public class Command1 : ICommand
{
}
public class Command2 : ICommand
{
} ICommand command = new Command1();
if (!(command is Command2))
{
} if (command is not Command2)
{
} if ((command is ICommand) && !(command is Command2))
{
} if (command is ICommand and not Command2)
{
} if (command is Command1 or Command2)
{
} var number = new Random().Next(1, 10);
if (number > 2 && number < 8)
{
} if (number is > 2 and < 8)
{
} public static bool IsLetterOrSeparator(char c) => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '.' || c == ',';
public static bool IsLetterOrSeparator(char c) => c is (>= 'a' and <= 'z') or (>= 'A' and <= 'Z') or '.' or ',';
var number = new Random().Next(1, 10);
if (number <= 0)
{
Console.WriteLine("Less than or equal to 0");
}
else if (number > 0 && number <= 10)
{
Console.WriteLine("More than 0 but less than or equal to 10");
}
else
{
Console.WriteLine("More than 10");
} // C#9.0
switch (number)
{
case <= 0:
Console.WriteLine("Less than or equal to 0");
break;
case > 0 and <= 10:
Console.WriteLine("More than 0 but less than or equal to 10");
break;
default:
Console.WriteLine("More than 10");
break;
} // C#7.0
switch (number)
{
case int value when value <= 0:
Console.WriteLine("Less than or equal to 0");
break;
case int value when value > 0 && value <= 10:
Console.WriteLine("More than 0 but less than or equal to 10");
break;
default:
Console.WriteLine("More than 10");
break;
} var message = number switch
{
<= 0 => "Less than or equal to 0",
> 0 and <= 10 => "More than 0 but less than or equal to 10",
_ => "More than 10"
}; private static int GetDiscount(Product p) => p switch
{
Food => 0, // Food _ => 0 before C# 9
Book b => 75, // Book b _ => 75 before C# 9
_ => 25
}; کتابخانه ای مناسب و مفید جهت کار با نقشه در اندروید ، برای توضیحات بیشتر به ریپو گیتهاب مراجعه کنید.
لینکدموی کتابخانه
namespace MyNewsWCFLibrary
{
using System;
using System.Collections.Generic;
public partial class tblNews
{
public int tblNewsId { get; set; }
public int tblCategoryId { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public System.DateTime RegDate { get; set; }
public Nullable<bool> IsDeleted { get; set; }
public virtual tblCategory tblCategory { get; set; }
}
} using System.Runtime.Serialization;
namespace MyNewsWCFLibrary
{
using System;
using System.Collections.Generic;
[DataContract]
public partial class tblNews
{
[DataMember]
public int tblNewsId { get; set; }
[DataMember]
public int tblCategoryId { get; set; }
[DataMember]
public string Title { get; set; }
[DataMember]
public string Description { get; set; }
[DataMember]
public System.DateTime RegDate { get; set; }
[DataMember]
public Nullable<bool> IsDeleted { get; set; }
public virtual tblCategory tblCategory { get; set; }
}
} namespace MyNewsWCFLibrary
{
using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
[DataContract]
public partial class tblCategory
{
public tblCategory()
{
this.tblNews = new HashSet<tblNews>();
}
[DataMember]
public int tblCategoryId { get; set; }
[DataMember]
public string CatName { get; set; }
[DataMember]
public bool IsDeleted { get; set; }
public virtual ICollection<tblNews> tblNews { get; set; }
}
} BEGIN TRANSACTION
GO
ALTER TABLE dbo.tblNews
DROP CONSTRAINT FK_tblNews_tblCategory
GO
ALTER TABLE dbo.tblCategory SET (LOCK_ESCALATION = TABLE)
GO
COMMIT
BEGIN TRANSACTION
GO
CREATE TABLE dbo.Tmp_tblNews
(
tblNewsId int NOT NULL IDENTITY (1, 1),
tblCategoryId int NOT NULL,
Title nvarchar(50) NOT NULL,
Description nvarchar(MAX) NOT NULL,
RegDate datetime NOT NULL,
IsDeleted bit NOT NULL
) ON [PRIMARY]
TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE dbo.Tmp_tblNews SET (LOCK_ESCALATION = TABLE)
GO
ALTER TABLE dbo.Tmp_tblNews ADD CONSTRAINT
DF_tblNews_IsDeleted DEFAULT 0 FOR IsDeleted
GO
SET IDENTITY_INSERT dbo.Tmp_tblNews ON
GO
IF EXISTS(SELECT * FROM dbo.tblNews)
EXEC('INSERT INTO dbo.Tmp_tblNews (tblNewsId, tblCategoryId, Title, Description, RegDate, IsDeleted)
SELECT tblNewsId, tblCategoryId, Title, Description, RegDate, IsDeleted FROM dbo.tblNews WITH (HOLDLOCK TABLOCKX)')
GO
SET IDENTITY_INSERT dbo.Tmp_tblNews OFF
GO
DROP TABLE dbo.tblNews
GO
EXECUTE sp_rename N'dbo.Tmp_tblNews', N'tblNews', 'OBJECT'
GO
ALTER TABLE dbo.tblNews ADD CONSTRAINT
PK_tblNews PRIMARY KEY CLUSTERED
(
tblNewsId
) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
ALTER TABLE dbo.tblNews ADD CONSTRAINT
FK_tblNews_tblCategory FOREIGN KEY
(
tblCategoryId
) REFERENCES dbo.tblCategory
(
tblCategoryId
) ON UPDATE NO ACTION
ON DELETE NO ACTION
GO
COMMIT