小编Rod*_*Rod的帖子

如何确定字符串是否已在C#中以编程方式编码？

让我们举例如字符串:

<p>test</p>

我想让我的逻辑理解它已被编码的这个值..任何想法？谢谢

这是:

foreach(Type item in myCollection)
{
   StringBuilder sb = new StringBuilder();
}

慢得多:

StringBuilder sb = new StringBuilder();

foreach(Type item in myCollection)
{
   sb = new StringBuilder();
}

换句话说,我宣布我的地方真的很重要StringBuilder吗？

如何将参数添加到以下Entity Framework原始SQL命令？例如,如果我想创建Id一个参数怎么办？

        using (var context = new NorthwindDBEntities())
        {
            context.Database.ExecuteSqlCommand(@"
                UPDATE dbo.Customers 
                SET Name = 'Test' WHERE Id = 1
            ");

        }

所以我jest用来测试我的node.js应用程序并且测试结果很好,但是我从jest获得了关于打开句柄的消息.任何见解？

jest --detectOpenHandles

PASS src/libs/user/tests /user_model_test.js PASS src/tests /app_test.js PASS src/libs/user/tests /user_service_test.js

测试套件:3次通过,总共3次测试:14次通过,总共14次快照:0总时间:7.209s跑完所有测试套件.

Jest检测到以下4个打开的句柄可能使Jest退出:

●承诺

  2 | // we use a test database for testing
  3 | var mongoDB = 'mongodb://localhost/my_db_conn';
> 4 | mongoose.connect(mongoDB);
    |          ^
  5 | const User = require('../user_model');
  6 |
  7 | describe("User model test", () => {

  at NativeConnection.Object.<anonymous>.Connection.openUri (node_modules/mongoose/lib/connection.js:424:19)
  at Mongoose.Object.<anonymous>.Mongoose.connect (node_modules/mongoose/lib/index.js:208:15)
  at Object.<anonymous> (src/libs/user/__tests__/user_model_test.js:4:10)

Run Code Online (Sandbox Code Playgroud)

●承诺

   8 | });
   9 |
> 10 | module.exports = mongoose.model("User", UserSchema); …

Run Code Online (Sandbox Code Playgroud)

所以我开始了微服务的旅程.我花了几个小时在网上尝试沉浸在这个话题中.

我还没有完全理解的一个概念是不使用SQL连接的想法,因此为作者提供了一个小的独立数据库,对于书籍也有相同的独立数据库.

所以我理解以下SQL:

BooksTable - id, name, authorid
AuthorsTable - id, name

select book.name, author.name from book 
join author on book.authorId = author.id

在Node.js世界中

index.js

app.get('/api/books' bookDomain.get());

bookDomain.js

exports.get = () => {
  const books = bookService.get();

  const authors = authorService.get();

  /*
    This is where I'm lost: how do you achieve the simple SQL 
    above? I'm assuming in the domain is where this information is 
    "joined"? am I correct?
  */
};

服务

Database1
**bookService.js**
database context

Database2
**authorService.js** …

有没有办法将datetime value(getdate())插入/更新到如下所示的临时表中:

select id, null as testdate
into #temp_table

然后声明:

update #temp_table 
set testdate=getdate()

我收到错误:

无法将datetime转换为int ...

谢谢.

我在vs2008中进行了单元测试,每次我现在运行它都说

    Executing the current test run will produce a new test run result, which will exceed
 the limit of 25 that is currently specified. If you continue, older test run results and
 their associated deployments will be deleted from the hard drive...

这是什么意思,我如何清除旧的测试运行结果？为什么这是重要的信息？

我正在尝试创建一个接受任何通用列表的用户控件,以便我可以遍历它并创建CSV导出.是否可以公开可以接受任何类型的公共财产？(即List<Product>,List<Customer>等).如果是,如何？

public IEnumerable<T> AnyList { get; set; }

这就是我所拥有的实用方法:

public static byte[] ToCsv<T>(string separator, IEnumerable<T> objectlist)
{
    //Type t = typeof(T); Deleted this line.

    //Here's the line of code updated.
    PropertyInfo[] propertyNames = objectlist.First().GetType().GetProperties();

    string header = String.Join(separator, propertyNames.Select(f => f.Name).ToArray());

    StringBuilder csvdata = new StringBuilder();
    csvdata.AppendLine(header);

    foreach (var o in objectlist)
        csvdata.AppendLine(ToCsvFields(separator, propertyNames, o));

    return Encoding.ASCII.GetBytes(csvdata.ToString());
}

public static string ToCsvFields(string separator, PropertyInfo[] fields, object o)
{
    StringBuilder linie = new StringBuilder();

    foreach (var f …

我有一个如下列:

1 red
2 blue
3 red
4 
5 blue
6
7
8 white

空白指的是它上面的记录.因此#4将与红色相关联,而6和7将为蓝色.

是否有一种简单的方法可以填充整个色谱柱的空白？

你如何从阵列中删除空白项目？

迭代并将非空白项目分配给新数组？

String test = "John, Jane";

//Without using the test.Replace(" ", "");

String[] toList = test.Split(',', ' ', ';');