我正在刷新我的C#技能并阅读C#书.我params在数组章节中遇到了关键字.为什么有人会实际使用params关键字而不是只是将常规数组传递给方法.我测试了使用和不使用params关键字传递数组的两种方法.他们都工作得很好.有没有真正的理由使用params关键字?
这是我的代码:
using System;
namespace ConsoleApplication9
{
class Program
{
static void Main(string[] args)
{
string[] classname = new string[5] { "cs150", "cs250", "cs270", "cs300", "cs350" };
Prints(classname);
Console.Read();
}
public static void Prints(params string[] t)
{
foreach (var s in t)
{
Console.WriteLine(s);
}
}
}
}
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这是没有参数的代码:
using System;
namespace ConsoleApplication9
{
class Program
{
static void Main(string[] args)
{
string[] classname = new string[5] { "cs150", "cs250", "cs270", "cs300", …Run Code Online (Sandbox Code Playgroud) string uri = "myurl";
string blobstatus = GetBlobStatus(uri);
if (blobstatus != LeaseStatus.Locked.ToString())
{
string response = AquireBlob(uri);
//process data.
string abc = ":em";
ReleaseBlob(response, uri);
}
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以上是我在blob上租用和释放锁的代码.我看这种方法用于多实例工作者的角色,我想运行之后的特定代码x的时间间隔,为多个实例可以在同一时间执行代码.
问题是我设法得到了LeaseId正确的但是当第二个实例检查blob租约状态时,它总是未指定.为什么会这样?任何线索?
我按照以下链接获得了先机.
string[][] Chop = null;
string[] Line = null;
private void button1_Click(object sender, EventArgs e)
{
Line = textBox1.Text.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None); // Im succesfull at cutting the input per line and stores it per line in Line variable.
for(int x = 0;x < Line.Length; x++)
Chop[][x] = Line[x].Split(' ');
//I want the Chop to have an array of array of strings.
Run Code Online (Sandbox Code Playgroud) 我想获取从库中挑选或最近点击的图像的名称 -
-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
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我正在使用此代码:
-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
AppDelegate *del = [[UIApplication sharedApplication]delegate];
[self dismissModalViewControllerAnimated:YES];
image = [info objectForKey:UIImagePickerControllerOriginalImage];
NSLog(@"imagekbgfg=====>%@",image);
[self.imageView setImage:image];
imgName = [info objectForKey:UIImagePickerControllerOriginalImage];
del.mainImgName = imgName;
del.imageData = UIImageJPEGRepresentation(image, 1.0);
del.imageApp = image;
}
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
{
image = [info objectForKey:UIImagePickerControllerOriginalImage];
}
}
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我怎样才能做到这一点?
我目前正在处理显示项目列表。我创建了一个GetNextItem返回obj1. 当我从 调用该方法时,出现buttonClick以下错误:
Cannot implicitly convert type 'TreeFarm.Form1.fruit_trees' to 'string'.
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不知道为什么要这样做。
public items_list GetNextItem()
{
items_list obj1 = this.current_item;
if (obj1 != null)
{
current_item = current_item.next_item;
}
return obj1;
}
ListForItems mainlist = new ListForItems();
private void ShowNextItem_Click(object sender, EventArgs e)
{
labelSpecificItem.Text = mainlist.GetNextItem();
}
Run Code Online (Sandbox Code Playgroud) 我是ASP.NET的新手并尝试从数据库中检索数据集,但标题显示我遇到了错误
这是代码,有什么问题?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
public partial class Admin_addNode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
var category = new category();
DataSet ds = new DataSet();
ds = category.getNode();
DataTable tbl = ds.Tables[0];
for (int i = 0; i < tbl.Rows.Count; i++)
{
DataRow myRow = tbl.Rows[i];
string MyValue = myRow["title"].ToString();
Response.Write(MyValue);
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
}
}
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protected void …
我应该如何知道应用程序是否正在运行或处理某些内容?让我们说我正在尝试将大量数据写入文件,那时应用程序没有响应.我想知道应用程序的当前状态.
在C#中,我可以这样做:
public class QuadTree<T> where T : IHasRect
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有没有办法在Java中做类似的事情?
你能告诉我怎么把它翻译成TypeScript?使用SharpKit.JavaScript;
namespace MyNamespace
{
[JsType(JsMode.Prototype)]
public class JsEventArgs
{
}
public delegate void JsEventHandler<in T>(object sender, T args) where T : JsEventArgs;
public delegate void JsEventHandler(object sender, JsEventArgs args);
}
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并在其他类中使用:
public event JsEventHandler<LayerVisivilityEventArgs> Changed;
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我试过了:
module JsEvent {
export class JsEventArgs {
}
public JsEventHandler: (sender: Object, args: any) => void;
public JsEventHandler: (sender: Object, args: JsEventArgs) => void;
}
Run Code Online (Sandbox Code Playgroud) 我在C#中使用LINQ搜索.我的一个搜索需要将a转换string为int.当我尝试使用int.parse()或时convert.toInt32(),它显示错误(在LINQ中无法识别)
例如:
var google = from p in ctx.dates
where int.Parse(p.effDate) < 20101212 && int.Parse(p.effDate) > 20121212
select p;
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正如你所看到的,我有一个字符串,其中包含我的日期yyyymmdd格式,我想将其转换为整数,以便我可以在这些日期之间进行搜索.
我有这样的事情:
public class Ship
{
public void PositionX_pixels_set1(float _position_x){position_x = _position_x;}
public class Engine : Ship
{
public int engines() { return 5; }
public class Piston
{
public int pistons(){return 5;}
}
}
}
void Main
{
Ship ship = new Ship()
int a = ship.Engine.Piston.pistons;//why this not working?
}
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我不知道我做错了什么.为什么"ship.Engine.Piston.pistons"不起作用?
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