Builder设计模式和Factory设计模式有什么区别?
哪一个更有利,为什么?
如果我想测试和比较/对比这些模式,我如何将我的发现表示为图表?
design-patterns factory-method factory-pattern builder-pattern
如何对通用列表DESC和ASC进行排序?使用LINQ而不使用LINQ?我正在使用VS2008.
class Program
{
static void Main(string[] args)
{
List<int> li = new List<int>();
li.Add(456);
li.Add(123);
li.Add(12345667);
li.Add(0);
li.Add(1);
li.Sort();
foreach (int item in li)
{
Console.WriteLine(item.ToString() + "\n");
}
Console.ReadKey();
}
}
Run Code Online (Sandbox Code Playgroud) 如果我尝试执行以下查询:
EXEC sp_rename 'ENG_TEst.[ENG_Test_A/C_TYPE]', 'ENG_Test_AC_TYPE', 'COLUMN'
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我收到一个错误:
参数@ objname是不明确的,或者声明的@objtype(COLUMN)是错误的.
我该如何解决?
如何导出GridView.DataSource到数据表或数据集?
我什么时候应该选择静态课程还是普通课程?或者:他们之间有什么区别?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace staticmethodlar
{
class Program
{
static void Main(string[] args)
{
SinifA.method1();
}
}
static class SinifA
{
public static void method1()
{
Console.WriteLine("Deneme1");
}
}
public static class SinifB
{
public static void method2()
{
Console.WriteLine("Deneme2");
}
}
public class sinifC
{
public void method3()
{
Console.WriteLine("Deneme3");
}
}
public class sinifD : sinifC
{
void method4()
{
Console.WriteLine("Deneme4");
}
sinifC sinifc = new sinifC(); // I need to use …Run Code Online (Sandbox Code Playgroud) 以下代码生成错误:
错误:'CERas.CERAS'是'type',在给定的上下文中无效
为什么会出现此错误?
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WinApp_WMI2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
CERas.CERAS = new CERas.CERAS();
}
}
}
Run Code Online (Sandbox Code Playgroud) 如何在SQL Server中将hh:mm:ss转换为hh:mm?
select Count(Page) as VisitingCount,Page,CONVERT(VARCHAR(8),Date, 108) from scr_SecuristLog
where Date between '2009-05-04 00:00:00' and '2009-05-06 14:58'
and [user] in(select USERNAME
from scr_CustomerAuthorities )
group by Page,Date order by [VisitingCount] asc
Run Code Online (Sandbox Code Playgroud) 我正在尝试在Web服务中生成一些代码.但是它返回了2个错误:
1)List是一种类型,但是像变量一样使用
2)方法"客户"没有重载需要"3个参数"
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
public class wstest : System.Web.Services.WebService
{
[WebMethod]
public List<Customer> GetList()
{
List<Customer> li = List<Customer>();
li.Add(new Customer("yusuf", "karatoprak", "123456"));
return li;
}
}
public class Customer
{
private string name;
private string surname;
private string number;
public string Name { get { return name; } set { name = value; } }
public string SurName { get { return surname; } set { surname = value; } }
public string …Run Code Online (Sandbox Code Playgroud) 我有Table1,我需要让它看起来像Table2:
VisitingCount | Date
-----------------------
1 | 15:09
3 | 15:10
7 | 15:15
1 | 15:39
2 | 15:40
3 | 15:47
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VisitingCount | Date
-----------------------------
11 | 15:00-15:30
6 | 15:30-16:00
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我写了一个sql用户定义的函数,如下所示:
create FUNCTION [dbo].[fn_GetActivityLogsArranger] (@time AS nvarchar(max))
RETURNS nvarchar(max)
AS
BEGIN
declare @Return varchar(30)
select @Return =
case
when @time between '15:00' and '15:30' then '15:00-15:30'
when @time between '15:30' and '16:00' then '15:30-16:00'
when @time between '16:00' and '16:30' then '16:00-16:30'
when @time between …Run Code Online (Sandbox Code Playgroud) 我遇到了有关天蓝色管道的非常有趣的问题。问题是“构建上下文之外的禁止路径”。如果 Dockerfile 中有指向另一个目录的添加行,则映像的构建会失败并显示消息“禁止路径”。我该如何解决这个问题?
我最近尝试 Dockerize 一个 C# 项目,因此我向该项目添加了一个 docker 文件夹并创建了一个简单的 Dockerfile 来开始使用,如下所示:
错误:
f83e9c616794: Pulling fs layer
9887694812e5: Pulling fs layer
9887694812e5: Verifying Checksum
9887694812e5: Download complete
dd4da9d953fb: Verifying Checksum
dd4da9d953fb: Download complete
f83e9c616794: Verifying Checksum
f83e9c616794: Download complete
dd4da9d953fb: Pull complete
f83e9c616794: Pull complete
9887694812e5: Pull complete
Digest: sha256:85ea9832ae26c70618418cf7c699186776ad066d88770fd6fd1edea9b260379a
Status: Downloaded newer image for mcr.microsoft.com/dotnet/sdk:5.0
---> bd73c72c93a1
Step 5/25 : WORKDIR /src
---> Running in b457b1934a7e
Removing intermediate container b457b1934a7e
---> a50c5df6f929
Step 6/25 : COPY ["./src/xxxxx.Web/xxxxx.Web.csproj", "src/xxxxx.Web/"]
COPY …Run Code Online (Sandbox Code Playgroud) c# ×5
.net ×4
sql ×3
sql-server ×3
asp.net ×2
azure ×1
azure-devops ×1
docker ×1
dockerfile ×1
generics ×1
gridview ×1
linq ×1
oop ×1
wmi ×1