与使用Silverlight泛型问题 [英] Issues with Generics using Silverlight
问题描述
我创建使用Silverlight 5（VS 2010）C＃Web应用程序。
I am creating a C# web application using Silverlight 5 (VS 2010).
我最初创建一个控制台应用程序，它工作正常，现在我适应它变成一个Web应用程序。
I initially created a console application which works fine and now i am adapting it into a web app.
即使是在Web应用程序，它正在罚款特别设置的数据类型（例如说为 INT 而不是<的; T> 这是工作的罚款），但是当我用普通的话它不工作。 它编译无错，但它甚至没有调试被设置为切换断点的区域。最初，GUI是这样的：
Even in web application it is working fine for particularly set data type (say for example for int instead of <T> it is working fine) but when I use generic then it doesn't work. It compiles error free but it doesn't even debug the area which is set to "toggle break point". Initially the GUI was like this:
但是作为控制传递给容易出错的部分中，GUI突然消失这样
But as the control passes to the error prone part, the GUI suddenly disappears like this
< IMG SRC =http://i.stack.imgur.com/fU1aj.pngALT =在这里输入的形象描述>
和在哪里存放的地方在破发点被该替换
And the place where I kept the break points is replaced by this
（见最左边）作为一个结果，我不能够调试找到问题
一些解释什么，我试图做的：在给定的代码下面我有一个二进制文件，并存储在fileContents，这是数据类型的内部字节[] （我不透露给你的方法来读取该文件，现在你可以认为fileContents包含的MainPage内的二进制文件的内容类）。其实我会储存（在二进制文件格式0和1）的符号，会发现它的频率（通过计算它的文件中重复的时间数字，但有没有问题，所以我不写它的方法）。但在我这个代码 processingValue 变量将是通用型的（< T> ），我将在存储符号（这是<也; T> 键入（这个符号从二进制文件中读取可能是其中之一短 / INT / 长 / UInt32的 / UINT64 等），我不会在我的代码显示）。
Some explanation what I am trying to do: in the given code below I have a binary file and stored inside the "fileContents" which is of data type byte[] (I am not disclosing to you the method to read that file, for now you can consider that fileContents contains the contents of a binary file inside the MainPage class). Actually I will store the symbols (of the form 0 and 1 in binary file) and will find its frequency (by counting number of time it repeats in the file, but that has no problem so I am not writing the method for it). But this processingValue variable in my code will be of generic type(<T>) which I will store in "symbol" (which is also of <T> type (this symbol read from binary file could be one of these short/int/long/UInt32/UInt64 etc.) which I am not showing in my code).
我有这样一个场景：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace
{
public partial class MainPage: UserControl
{
byte[] fileContent;
public MainPage()
{
InitializeComponent();
fileContent = null; //Suppose it already contains binary fileContents
}
//I press the button in order to call the Huffman class because it's Object declared in it
public void ButtonClickEvent(object sender, RoutedEventArgs e)
{
MessageBox.Show("check0");
//Suppose i had stored contents of a file inside "fileContent" , so fileContent below contains
//contents of a binary file
//**THE LINE BELOW IS ERROR PRONE**
Huffman < uint > obj1 = new Huffman < uint > (this, fileContent, BitConverter.ToUInt32);
//This Object creation creates problem, whereas if i remove generic type (<T>), Then it works fine.
//If i don't use genrics then i do it like this : Huffman obj1 = new Huffman(this, fileContent); (Whereas <T> in Huffman class is replaced by "int" and it works fine)
MessageBox.Show("check1"); //This check box is never executed
}
}
public class Huffman < T > where T: struct,IComparable < T > ,IEquatable < T >
{
public Huffman(MainPage Object, byte[] fileContent, Func < byte[], int, T > converter)
{
MessageBox.Show("check2"); //It never executes
length = fileContent.Length;
size = Marshal.SizeOf(typeof (T));
byte[] data;
for (long position = 0; position + size < length; position += size)
{
data = fileContent; //This data conatains the filecontents now
T processingValue = converter(data, 0);
{
//I do something here with processingValue it could be int16/int32/int64/uin32/uint64 etc.
}
}
}
}
}
有任何问题 BitConverter 函数创建对象在MainPage类？
Is there any problem in BitConverter function in Object Creation in MainPage class?
我甚至无法调试霍夫曼类，我将在开始破发点和霍夫曼的结束点。上的Internet Explorer类，但控制不来的内部和按钮（使用XAML GUI创建）消失
I am even not able to debug the Huffman class, I set the break points at starting and ending points of Huffman class but the control don't come inside and the buttons (created using XAML GUI) on the Internet Explorer disappears.
下面是我的全码：（请关注我正在读一个二进制文件（canbe采取测试我的代码扩展名的文件名为.o（FileName.o），我读得好））：
Here is my full code : (please pay attention i am reading a Binary file (any file with extension ".o"(FileName.o) canbe taken for testing my code, i read well)):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace FinalSS
{
public partial class MainPage : UserControl
{
public const int CHUNK_SIZE = 4096;
public const string UPLOAD_URI = "http://localhost:50323/FileUpload.ashx?filename={0}&append={1}";
public const string UPLOAD_DIALOG_FILTER = "All files (*.*)|*.*|Jpeg Images (*.jpg)|*.png|PNG Images (*.png)|*.png";
private Stream data;
private string fileName;
private long TotalBytes;
private long UploadedBytes;
byte[] fileContent;
public event Action simpleEvent;
public MainPage()
{
InitializeComponent();
progressBar.Visibility = Visibility.Collapsed;
textBox.Visibility = Visibility.Collapsed;
// fileContent = null;
UploadedBytes = 0;
TotalBytes = 0;
}
/* public void comboInvoke()
{
comboBox1.Items.Add("byte");
comboBox1.Items.Add("sbyte");
comboBox1.Items.Add("short");
comboBox1.Items.Add("int");
comboBox1.Items.Add("long");
} */
public void BrowseButtonClick(object sender, RoutedEventArgs e)
{ OpenFileDialog dlg = new OpenFileDialog();
dlg.Multiselect = false;
dlg.Filter = UPLOAD_DIALOG_FILTER;
bool? retVal = dlg.ShowDialog();
if (retVal != null && retVal == true)
{
progressBar.Visibility = Visibility.Visible;
textBox.Visibility = Visibility.Visible;
textBox.Text = "Uploading the file...";
data = dlg.File.OpenRead();
TotalBytes = data.Length;
UploadedBytes = 0;
fileName = dlg.File.Name;
progressBar.Maximum = TotalBytes;
UploadFileChunk();
}
}
private void UploadFileChunk()
{
textBox.Text = "Upload in progress...";
string uploadUri = "";
if (UploadedBytes == 0)
{
uploadUri = String.Format(UPLOAD_URI, fileName, 0); // Dont't append
}
else if (UploadedBytes < TotalBytes)
{
uploadUri = String.Format(UPLOAD_URI, fileName, 1); // append
}
else
{
return; // Upload finished
}
fileContent = new byte[CHUNK_SIZE];
int bytesRead = data.Read(fileContent, 0, CHUNK_SIZE);
data.Flush();
WebClient wc = new WebClient();
wc.OpenWriteCompleted += new OpenWriteCompletedEventHandler(wc_OpenWriteCompleted);
Uri u = new Uri(uploadUri);
wc.OpenWriteAsync(u, null, new object[] { fileContent, bytesRead });
UploadedBytes += fileContent.Length;
MessageBox.Show("check0");
Huffman<uint> obj1 = new Huffman<uint>(this, fileContent, BitConverter.ToUInt32);
MessageBox.Show("check1");
}
void wc_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
{
progressBar.Value = UploadedBytes;
if (e.Error == null)
{
object[] objArr = e.UserState as object[];
byte[] fileContent = objArr[0] as byte[];
int bytesRead = Convert.ToInt32(objArr[1]);
Stream outputStream = e.Result;
outputStream.Write(fileContent, 0, bytesRead);
outputStream.Close();
if (UploadedBytes < TotalBytes)
{
UploadFileChunk();
}
else
{
textBox.Text = fileName;
}
}
}
/// <summary>
/// ///////////////////////////////////////////////////////
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ShowButtonClick(object sender, RoutedEventArgs e)
{
if (simpleEvent != null) simpleEvent();
}
private void CompressButtonClick(object sender, RoutedEventArgs e)
{
}
private void CloseButtonClick(object sender, RoutedEventArgs e)
{
}
private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
private void textBox_TextChanged(object sender, TextChangedEventArgs e)
{
}
private void TreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
}
private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
}
private void listBox2_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
private void TreeViewItem_Selected_1(object sender, RoutedEventArgs e)
{
}
private void TreeViewItem_Selected(object sender, RoutedEventArgs e)
{
}
}
public class Huffman<T> where T : struct, IComparable<T>, IEquatable<T>
{
long length;
int size;
byte[] data;
public class Node
{
public Node next, left, right;
public T symbol; // This symbol is of generic type.
public int freq;
public int is_processed;
}
public Node front, rear;
public Huffman(MainPage form, byte[] fileContent,Func < byte[], int, T > converter)
{
MessageBox.Show("check2");
// form.simpleEvent += () => ShowClick(form,fileContent);
length = 0;
front = null;
rear = null;
MessageBox.Show("check4");
length = fileContent.Length;
size = Marshal.SizeOf(typeof(T));
Stream stream = new MemoryStream(fileContent);
{
for (long position = 0; position + size < length; position += size)
{
data = fileContent;
T processingValue = converter(data, 0);
{
Node pt, temp;
bool is_there = false;
pt = front;
while (pt != null)
{
form.listBox1.Visibility = Visibility.Visible;
if (pt.symbol.Equals(processingValue))
{
pt.freq++;
is_there = true;
break;
}
temp = pt;
pt = pt.next;
}
if (is_there == false)
{
temp = new Node();
temp.symbol = processingValue;
temp.freq = 1;
temp.left = null;
temp.right = null;
temp.next = null;
temp.is_processed = 0;
if (front == null)
{
front = temp;
}
else
{
temp.next = front;
front = temp;
}
}
}
}
stream.Close();
}
MessageBox.Show("Yes correctly done");
merge_sort(front);
Print_tree(front, form);
}
public Node merge_sort(Node head)
{
if (head == null || head.next == null)
{
return head;
}
Node middle = getMiddle(head);
Node sHalf = middle.next;
middle.next = null;
return merge(merge_sort(head), merge_sort(sHalf));
}
public Node merge(Node a, Node b)
{
Node dummyHead, curr;
dummyHead = new Node();
curr = dummyHead;
while (a != null && b != null)
{
if (a.freq <= b.freq)
{
curr.next = a;
a = a.next;
}
else
{
curr.next = b;
b = b.next;
}
curr = curr.next;
}
curr.next = (a == null) ? b : a;
return dummyHead.next;
}
public Node getMiddle(Node head)
{
if (head == null)
{
return head;
}
Node slow, fast;
slow = fast = head;
while (fast.next != null && fast.next.next != null)
{
slow = slow.next;
fast = fast.next.next;
}
return slow;
}
///////
public void Print_tree(Node treee,MainPage obj)
{
Node pt = treee;
while (pt != null)
{
obj.listBox1.Items.Add("Symbol :" + pt.symbol + " -" + " Frequency : " + pt.freq);
// Debug.WriteLine("Symbol :" + pt.symbol + " -" + " Frequency : " + pt.freq);
pt = pt.next;
}
}
}
}
下面是XML代码：
<UserControl x:Class="FinalSS.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
d:DesignHeight="300" d:DesignWidth="400" Loaded="UserControl_Loaded">
<Grid x:Name="LayoutRoot" Background="Wheat" Visibility="Visible" Height="348" Width="681">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="37*" />
<ColumnDefinition Width="86*" />
<ColumnDefinition Width="558*" />
</Grid.ColumnDefinitions>
<sdk:TreeView SelectedItemChanged="TreeView_SelectedItemChanged" Margin="12,12,12,41" Background="wheat" Grid.ColumnSpan="3">
<sdk:TreeViewItem Header="File" Selected="TreeViewItem_Selected" >
<sdk:TreeViewItem.Items>
<sdk:TreeViewItem Selected="TreeViewItem_Selected_1">
<sdk:TreeViewItem.Header>
<StackPanel Orientation="Horizontal" >
<Button Content="Browse File" Width="76" Height="20" Click="BrowseButtonClick"></Button>
</StackPanel>
</sdk:TreeViewItem.Header>
</sdk:TreeViewItem>
<sdk:TreeViewItem Selected="TreeViewItem_Selected_1">
<sdk:TreeViewItem.Header>
<StackPanel Orientation="Horizontal">
<Button Content="Show Data" Width="75" Height="20" Click="ShowButtonClick"></Button>
</StackPanel>
</sdk:TreeViewItem.Header>
</sdk:TreeViewItem>
<sdk:TreeViewItem Selected="TreeViewItem_Selected_1">
<sdk:TreeViewItem.Header>
<StackPanel Orientation="Horizontal">
<Button Content="Compress" Width="75" Height="20" Click="CompressButtonClick"></Button>
</StackPanel>
</sdk:TreeViewItem.Header>
</sdk:TreeViewItem>
<sdk:TreeViewItem Selected="TreeViewItem_Selected_1">
<sdk:TreeViewItem.Header>
<StackPanel Orientation="Horizontal">
<Button Content="close" Width="75" Height="20" Click="CloseButtonClick" ></Button>
</StackPanel>
</sdk:TreeViewItem.Header>
</sdk:TreeViewItem>
</sdk:TreeViewItem.Items>
</sdk:TreeViewItem>
</sdk:TreeView>
<ProgressBar Name="progressBar" Height="9" HorizontalAlignment="Left" Margin="216,82,0,0" VerticalAlignment="Top" Width="139" Foreground="#FF3AB802" Grid.Column="2" Visibility="Collapsed" />
<TextBox Name="textBox" Height="23" HorizontalAlignment="Left" Margin="146,68,0,0" VerticalAlignment="Top" Width="66" Grid.Column="2" TextChanged="textBox_TextChanged" Visibility="Collapsed" />
<ListBox Height="148" HorizontalAlignment="Left" Margin="0,152,0,0" Name="listBox1" VerticalAlignment="Top" Width="197" ItemsSource="{Binding}" Visibility="Collapsed" Grid.Column="2" SelectionChanged="listBox1_SelectionChanged"></ListBox>
<ListBox Height="148" HorizontalAlignment="Right" Margin="0,154,160,0" Name="listBox2" VerticalAlignment="Top" Width="203" SelectionChanged="listBox2_SelectionChanged" Visibility="Collapsed" Grid.Column="2">
<ListBoxItem />
<ListBoxItem />
</ListBox>
<ComboBox Height="19" HorizontalAlignment="Left" Margin="13,204,0,0" Name="comboBox1" VerticalAlignment="Top" Width="104" SelectionChanged="comboBox1_SelectionChanged" Grid.ColumnSpan="2">
<ComboBoxItem />
<ComboBoxItem />
</ComboBox>
</Grid>
</UserControl>
至于我的担保人而言这个问题是由于 BitConverter 在霍夫曼调用构造函数func转换器造成的问题。 我想我需要使用Func键转换其他方式并非常感谢对我的帮助。
As far as my surety is concerned this problem is due to BitConverter in huffman constructor invoke the function Func converter creates problem. I guess i need to use Func converter some other way And big thanks for helping me.
推荐答案
我可能是错误的这一点，但...
I could be wrong about this but...
我不知道想你可以做你在做什么，无需添加更多的代码 -
I don't know think you can do what you are doing without adding more code -
<T>
，实际上是数据类型的占位符，使用编译器创建与该类型作品类。类/函数是由编译器时，可以指定与该类类型的变量创建。
is really a placeholder for a datatype, used by the compiler to create a class that works with that type. The class/function is created by the compiler when you specify a variable with that class type.
这听起来像你对我试图创建这种类型在运行时再调用此函数。通过这样做，你没有让编译器创建一个方法/类，以支持您的变量类型。
It sounds to me like you are trying to create this type at runtime and then call this function. By doing this you have not allowed the compiler to create a method/class to support your variable type.
您可能需要一些虚拟文件中声明一个类为每种类型，这样编译器会为这些类型的类
You may need to declare a class for each type in some dummy file so that the compiler will generate classes for those types.
在本文的详细一些信息请看下图：的 http://www.cs.umd.edu/class/fall2002/cmsc214/Projects/P2/proj2。 temp.html
Take a look at this article for some more info: http://www.cs.umd.edu/class/fall2002/cmsc214/Projects/P2/proj2.temp.html
这篇关于与使用Silverlight泛型问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
