小编Dav*_*eer的帖子

从 Uncle Bob 的书 Clean Code（示例是在 Java 中编写的，所以这是我的第一个 Java 翻译），我一直在玩质数重构示例。

问题是：您将如何重构以下代码？

这里有 4 个版本：UglyVersion :-)、BobVersion、PeteVersion、PeteVersionClassMember。我这样做是为了好玩，希望你也喜欢:-)

class ProgramBad
{
    static void Main()
    {
        int[] result = GeneratePrimes.generatePrimes(30);
        foreach (var i in result)
            Console.Write(i.ToString() + ", ");
    }
}

/// <summary>
/// Given an array of integers starting at 2, cross out the multiples of 2.  Fine the next
/// uncrossed integer, and cross out all of its multiples.
/// Repeat until you have passed the square root of the maximum value …

如何在MSTest中断言返回的集合的顺序是否正确？

[TestMethod]
    public void when_sorting_movies_it_should_be_able_to_sort_all_movies_by_title_descending()
    {
        populateTestMovies(movie_collection);
        MovieLibrary movieLibrary = new MovieLibrary(movie_collection);
        IEnumerable<Movie> results = movieLibrary.sort_all_movies_by_title_descending();
        Assert.IsTrue(results.Contains(theres_something_about_mary));
        Assert.IsTrue(results.Contains(the_ring));
        Assert.IsTrue(results.Contains(shrek));
        Assert.IsTrue(results.Contains(pirates_of_the_carribean));
        Assert.IsTrue(results.Contains(indiana_jones_and_the_temple_of_doom));
        Assert.IsTrue(results.Contains(cars));
        Assert.IsTrue(results.Contains(a_bugs_life));
        Assert.AreEqual(7, results.Count());
    }

我想通过转换为int的字符串来命令我的列表:

var orderedListOfRfidTags = uow.RfidTags.OrderBy(t => Convert.ToInt32(t.Number)).ToList();

但得到:不支持'ToInt32'方法.

我试图从WPF中的BackgroundWorker中读取复选框的值:

这不起作用:

bool? isSleepChecked = checkBoxSleep.Dispatcher.Invoke(DispatcherPriority.Normal, (ThreadStart)delegate{ return checkBoxSleep.IsChecked;});

无法将匿名方法转换为委托类型'System.Threading.ThreadStart',因为块中的某些返回类型不能隐式转换为委托返回类型

编辑 - 这是HB的答案,使用委托而不是lambda表达,我发现它更具可读性

bool? isSleepChecked = (bool?)checkBoxSleep.Dispatcher.Invoke(new Func<bool?>(delegate { return checkBoxSleep.IsChecked; }));

使用 Serilog 的 ASP.NET Core 5 Razor 页面

UseStatusCodePagesWithReExecute 按预期工作，并在进入我的 /CustomError 页面后重新执行页面。

如何抑制对重新执行页面的第二次调用的 Serilog 日志记录？

密码-postgres完整示例

// program.cs
public static void Main(string[] args)
{
    Log.Logger = new LoggerConfiguration()
        // if only do warning, then will get duplicate error messages when an exception is thrown, then again when re-executed
        // we do get 2 error message per single error, but only 1 stack trace
        .MinimumLevel.Override("Microsoft.AspNetCore", LogEventLevel.Fatal)
        .Enrich.FromLogContext()
        .WriteTo.Console()
        .CreateLogger();

    try
    {
        Log.Information("Starting up");
        CreateHostBuilder(args).Build().Run();
    }
    catch (Exception ex)
    {
        Log.Fatal(ex, …

问题:如果某个数字超出其类型的范围,您如何使程序失败？

下面的代码给出了200万以下素数之和的错误答案,因为我使用了int而不是long.

    [TestMethod]
    public void CalculateTheSumOfPrimesBelow2million()
    {
        int result = PrimeTester.calculateTheSumOfPrimesBelow(2000000); // 2million
        Assert.AreEqual(1, result); // 1,179,908,154 .. this was what I got with an int...
                                             // correct answer was 142,913,828,922 with a long
    }



public static class PrimeTester
{
    public static int calculateTheSumOfPrimesBelow(int maxPrimeBelow)
    {
        // we know 2 is a prime number
        int sumOfPrimes = 2;
        int currentNumberBeingTested = 3;
        while (currentNumberBeingTested < maxPrimeBelow)
        {
            double squareRootOfNumberBeingTested = (double)Math.Sqrt(currentNumberBeingTested);

            bool isPrime = true;
            for (int i = 2; …

我正在测试MvcContrib的网格进行排序.

我使用LightSpeed作为我的ORM

问题:编译错误:listOfRfidTags = ...

无法从用法中推断出方法'System.Linq.Enumerable.OrderBy(System.Collections.Generic.IEnumerable,System.Func,System.Collections.Generic.IComparer)'的类型参数.尝试显式指定类型参数.

public ActionResult Index(GridSortOptions sort)
        {
            IEnumerable<RfidTag> listOfRfidTags = uow.RfidTags;
            if(sort.Column != null) {
                listOfRfidTags = listOfRfidTags.OrderBy(sort.Column, sort.Direction);
            }
            ViewData["sort"] = sort;
            return View(listOfRfidTags);
        }

视图:

@Html.Grid(Model).Columns(column =>{
    column.For(a => Html.ActionLink("Edit", "Edit", new { id = a.Id })).Named("Edit");
    column.For(a => a.TagCode).Named("TagCode").Sortable(true);
    column.For(a => a.Number);
})

使用MVC3和实体框架.

我试图从数据模型中获得验证

问题:在实体框架保存中,如何自动为我的伙伴类添加[MetadataType标签？

[EdmEntityTypeAttribute(NamespaceName="ModelValidationTestModel", Name="Person")]
[Serializable()]
[DataContractAttribute(IsReference=true)]
[MetadataType(typeof(Person_Validation))] // I want EF to put this line in automatically
public partial class Person : EntityObject

...

[Bind(Exclude="PersonID")]
public class Person_Validation
{
    [Required]
    public string FirstName { get; set; }
    [Required]
    public string LastName { get; set; }
    [Required]
    public int Age { get; set; }
    [Required]
    public string Email { get; set; }
}

使用示例来自:http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx

我正在调查如何在循环内部修改循环结束值.这是.NET2代码(我正在使用VB).我明白这不太理想,但可以做到吗？

'inital value is 31
Dim currentNumberOfRowsInDataTable As Int32 = dataTable.Rows.Count - 1

For i As Integer = 0 To currentNumberOfRowsInDataTable
    Try
        If (dataTable.Rows(i)("DataItemSection") = "Platforms") Then
            Dim newRow As DataRow = rearrangedDataTable.NewRow()

            'do stuff

            dataTable.Rows.RemoveAt(i)
            'decrement to 30, however this has no influence on the loop
            currentNumberOfRowsInDataTable -= 1
        End If
    Catch
        'problem is that loop always goes to 31, whereas I want it to go to 30
        'so need to swallow the exception here
    End Try
Next

编辑 …

我正在尝试使用 NUnit 2.6.4 将这个工作 .NET2 C# 转换为 .NET2 VB.NET

[Test]
public void Test() {
    Assert.Throws<Exception>(delegate {
        DoSomething(2);
    });
}

public void DoSomething(int i) {
    throw new Exception();
}

然后进入VB：

<Test> _
Public Sub Test()
    Assert.Throws(Of Exception)(Sub() DoSomething(2))
End Sub

Public Sub DoSomething(i As Integer)
    Throw New Exception()
End Sub

这适用于 .NET4 但不适用于 .NET2 - 因为我使用的是匿名方法...但是如何在 VB.NET 中表达 .NET2 中的委托

就像是：AddressOf DoSomething(2)

感谢审稿人找到重复内容：How do I target attribute for a record class?

.NET 5.0 Web API不适用于具有所需属性的记录也与之相关。

我试图理解为什么 3. 位置记录属性在下面不起作用。

这是一个新的 ASP.NET Core Razor Pages Web 应用程序，其源代码位于https://github.com/djhmateer/record-test

https://daveabrock.com/2020/11/18/simplify-api-models-with-records似乎已经让它与 API 一起使用。

public class LoginModelNRTB : PageModel
{
    [BindProperty]
    // there will never be an InputModel on get
    // but if we set to nullable InputModel then the cshtml will produce dereference warnings
    // https://stackoverflow.com/a/54973095/26086
    // so this will get rid of the warnings as we are happy we will never …

请参阅下面的第二位代码..代码无法编译.我试图找出anon方法,我明白了..

但不是不使用我在网上找到的匿名方法的例子,它不能编译

使用VS2008 ..编译到.NET3.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestAnonymousMethods
{
    public class Program
    {
        // using an anon method
        static void Mainx(string[] args)
        {
            int[] _integers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

            int[] evenIntegers = Array.FindAll(_integers,
                                        // this is the anonymous method below
                                       delegate(int integer)
                                       {
                                           return (integer % 2 == 0);
                                       }
                );

            foreach (int integer in _integers) 
                Console.WriteLine(integer);

            foreach (int integer in evenIntegers)
                Console.WriteLine(integer);
        }

        // …

这工作:

    //delegate
    Parallel.For(1023456789, 1033456789, delegate(long i)
            {
                if (i % 10000000 == 0) Console.WriteLine("{0:N0}", i);
                if (IsPanDigital(i))
                {
                    list.Add(i);
                }
            }
        );

    //lambda expression
    Parallel.For(1023456789, 1033456789, i =>
            {
                if (i%10000000 == 0) Console.WriteLine("{0:N0}", i);
                if (IsPanDigital(i))
                {
                    list.Add(i);
                }
            }
        );

是否可以使用Func重写此逻辑？我在这里试过..不编译.

    var list = new List<long>();
    Parallel.For(1023456789, 1033456789, Blah(i, ref list));

public static Func<long> Blah(long i, ref List<long> list)
{
    if (i % 10000000 == 0) Console.WriteLine("{0:N0}", i);
    if (IsPanDigital(i))
    {
        list.Add(i);
    }
}

我试图看看它是否可以完成.