执行以下代码会产生错误:ProcessPerson没有重载匹配ThreadStart.
public class Test
{
static void Main()
{
Person p = new Person();
p.Id = "cs0001";
p.Name = "William";
Thread th = new Thread(new ThreadStart(ProcessPerson));
th.Start(p);
}
static void ProcessPerson(Person p)
{
Console.WriteLine("Id :{0},Name :{1}", p.Id, p.Name);
}
}
public class Person
{
public string Id
{
get;
set;
}
public string Name
{
get;
set;
}
}
怎么解决？
当我执行线程th1,th2和th3时,它们一个接一个地执行.如何更改我的代码,以便执行顺序不可预测.(不使用Random).
public class Test
{
static void Main()
{
Person p = new Person();
p.Id = "cs0001";
p.Name = "William";
Thread th1 = new Thread(()=>ProcessOne(p));
th1.Name = "ThreadOne";
th1.Start();
Thread th2 = new Thread(()=>ProcessTwo(p));
th2.Name = "ThreadTwo";
th2.Start();
Thread th3 = new Thread(()=> ProcessThree(p));
th3.Name = "ThreadThree";
th3.Start();
Console.ReadKey(true);
}
static void ProcessOne(Person p)
{
Console.WriteLine("Thread {0} is executing",
Thread.CurrentThread.Name);
Console.WriteLine("Id :{0},Name :{1}", p.Id, p.Name);
}
static void ProcessTwo(Person p)
{
Console.WriteLine("Thread {0} is executing",
Thread.CurrentThread.Name);
Console.WriteLine("Id :{0},Name :{1}", p.Id, …将以下内容转换为 lambda 表达式的方法是什么？
ThreadPool.QueueUserWorkItem(delegate
{
Console.WriteLine("Current Thread Id is {0}:",
Thread.CurrentThread.ManagedThreadId);
Console.WriteLine("I will be used as Callback");
}
);
如何开发一个可以从字母表(a,b,.... z)返回随机字符(单个字符)的扩展方法.
public static char RandomLetter(this char randomchar)
{
}
来自数据
OrderID OrderAmt OrderDate
----------- ---------- --------------------
1 10.50 2003-10-11 08:00:00
2 11.50 2003-10-11 10:00:00
3 1.25 2003-10-11 12:00:00
4 100.57 2003-10-12 09:00:00
5 19.99 2003-10-12 11:00:00
6 47.14 2003-10-13 10:00:00
7 10.08 2003-10-13 12:00:00
8 7.50 2003-10-13 19:00:00
9 9.50 2003-10-13 21:00:00
我想显示以下运行总计
OrderId OrderDate OrderAmt Running Total
----------- -------------------- ---------- -------------
1 2003-10-11 08:00:00 10.50 10.50
2 2003-10-11 10:00:00 11.50 22.00
3 2003-10-11 12:00:00 1.25 23.25
4 2003-10-12 09:00:00 100.57 123.82
5 2003-10-12 11:00:00 19.99 143.81
6 2003-10-13 …如何在扩展方法中指定降序
var qry=from p in context.Persons
orderby p.salary descending select p;
扩展方法
var qry=context.Persons.OrderBy(c=>c.salary);
我想要一个需要返回非元音词的扩展方法.我设计了
public static IEnumerable<T> NonVowelWords<T>(this IEnumerable<T> word)
{
return word.Any(w => w.Contains("aeiou"));
}
我收到错误,因为"T"不包含extanesion方法"Contains".
在分组数字时,我使用
string[] numbers =
{ "123", "34555", "91882", "100", "7823", "1111", "76551" };
var query = from digits in numbers
group digits by digits.Length into ByDigit
select
new { digit = ByDigit, length = ByDigit.Key };
当我想使用
var query = numbers.GroupBy() ( 我不知道如何命名,是否扩展链接？)
这是怎么做的？
这个问题是在面试时提出来的.我需要运行总计(仅使用Aggregate())
从数组
(即)
int[] array={10,20,30};
Expected output
10
30
60
当我使用Aggregate时(我应用了一些最糟糕的逻辑)
array.Aggregate((a, b) => { Console.WriteLine(a + b); return (a + b); });
1)It prints 30,60,对我来说没有使用return(a + b).
2)为了打印10,我必须通过添加元素零(即){0,10,20,30}来修改数组.
有什么整洁的工作可以把它变成现实吗？
什么是以下LINQ的扩展方法等效？
var qry = from a in context.A_Collections
from b in context.B_Collections
where a.PK == b.PK
select
new {
A_key = a.PK,
A_Value = a.Value,
B_Key = b.PK,
B_value = b.value
};
我的意思是
(不完全的)
var query = context.A_Collections.
Where(
a => a.PK == context.B_Collections.Select(b => b.PK)).
Select(
x => new {
A_key = a.Pk,
A_Value = a.Value,
B_Key = b.PK,
B_value = b.value
}
);