Знакомство с маршрутизированными событиями и командами в WPF

В этой статье рассматриваются следующие вопросы.

• Маршрутизация событий и визуальные деревья
• Маршрутизация команд
• Избежание проблем с фокусировкой команд
• Выход за рамки маршрутизированных команд

http://msdn.microsoft.com/ru-ru/magazine/cc785480.aspx

Inconsistent accessibility: field type 'type' is less accessible than field 'field'

class MyClass
// try the following line instead
// public class MyClass
{
}
 public class MyClass2
{
   public MyClass mf;   // CS0052
}

To avoid this arror you need to make class MyClass - public !!!

Multiple Window Interface for WPF

Multiple Document Interfaces (MDI) have come and gone in .NET and I am sure will someday come back again. In the meantime, I decided to write my very own implementation of MDI in WPF. Instead of multiple documents, I decided to extend my design to house multiple windows. The Multiple Window Interface contains many of the features of MDI with the addition of attachable windows. http://www.codeproject.com/KB/WPF/mwiwpf.aspx

Working with Checkboxes in the WPF TreeView

This article reviews a WPF TreeView whose items contain checkboxes. Each item is bound to a ViewModel object. When a ViewModel object’s check state changes, it applies simple rules to the check state of its parent and child items. This article also shows how to use the attached behavior concept to turn a TreeViewItem into a virtual ToggleButton, which helps make the TreeView’s keyboard interaction simple and intuitive. http://www.codeproject.com/KB/WPF/TreeViewWithCheckBoxes.aspx

Настройка отображения данных с привязкой данных и WPF

В этой статье рассматриваются следующие вопросы:

• Привязка данных в технологии WPF
• Отображение данных и иерархические данные
• Использование шаблонов
• Проверка ввода

http://msdn.microsoft.com/ru-ru/magazine/cc700358.aspx#id0190094

Как сделать ОДНУ страницу альбомной, когда все остальные в документе книжные в Word?

В последнем абзаце "книжной" страницы поставить Вставить->Разрыв->Новый раздел->начать со следующей страницы. Этот второй раздел (курсор в его абзаце) сделать "формат альбом" (в "параметрах страницы" - не на "весь документ", а на "текущий раздел"). А потом можно дальше вставить еще один разрыв=новый раздел, и его сделать опять книжным, и так сколько хочешь раз чередовать их в одном документе.

Grouping Data with the ListView Control

<asp:ListView ID="ProductList1" runat="server"
DataSourceID="ProductDataSource"
GroupItemCount="3" ItemPlaceholderID="itemsGoHere"
GroupPlaceholderID="groupsGoHere">

<LayoutTemplate>
<p>
<asp:PlaceHolder runat="server" ID="groupsGoHere"></asp:PlaceHolder>
</p>
</LayoutTemplate>

<GroupTemplate>
<ol>
<asp:PlaceHolder runat="server" ID="itemsGoHere"></asp:PlaceHolder>
</ol>
</GroupTemplate>

<ItemTemplate>
<li><%#Eval("ProductName")%></li>
</ItemTemplate>
</asp:ListView>

String Format for Double [C#]

The following examples show how to format float numbers to string in C#. You can use static method String.Format or instance methods double.ToString and float.ToString.

Digits after decimal point

This example formats double to string with fixed number of decimal places. For two decimal places use pattern „0.00“. If a float number has less decimal places, the rest digits on the right will be zeroes. If it has more decimal places, the number will be rounded.

[C#]

// just two decimal places

String.Format("{0:0.00}", 123.4567);      // "123.46"

 String.Format("{0:0.00}", 123.4);         // "123.40"

 String.Format("{0:0.00}", 123.0);         // "123.00"  

Next example formats double to string with floating number of decimal places. E.g. for maximal two decimal places use pattern „0.##“.

[C#]

// max. two decimal places

 String.Format("{0:0.##}", 123.4567);      // "123.46"

 String.Format("{0:0.##}", 123.4);         // "123.4"

 String.Format("{0:0.##}", 123.0);         // "123"  

Digits before decimal point

If you want a float number to have any minimal number of digits before decimal point use N-times zero before decimal point. E.g. pattern „00.0“ formats a float number to string with at least two digits before decimal point and one digit after that.

[C#]

// at least two digits before decimal point

 String.Format("{0:00.0}", 123.4567);      // "123.5"

 String.Format("{0:00.0}", 23.4567);       // "23.5"

 String.Format("{0:00.0}", 3.4567);        // "03.5"

 String.Format("{0:00.0}", -3.4567);       // "-03.5"  

Thousands separator

To format double to string with use of thousands separator use zero and comma separator before an usual float formatting pattern, e.g. pattern „0,0.0“ formats the number to use thousands separators and to have one decimal place.

[C#]

String.Format("{0:0,0.0}", 12345.67);     // "12,345.7"

 String.Format("{0:0,0}", 12345.67);       // "12,346"  

Zero

Float numbers between zero and one can be formatted in two ways, with or without leading zero before decimal point. To format number without a leading zero use # before point. For example „#.0“ formats number to have one decimal place and zero to N digits before decimal point (e.g. „.5“ or „123.5“).

Following code shows how can be formatted a zero (of double type).

[C#]

String.Format("{0:0.0}", 0.0);            // "0.0"

 String.Format("{0:0.#}", 0.0);            // "0"

 String.Format("{0:#.0}", 0.0);            // ".0"

 String.Format("{0:#.#}", 0.0);            // ""  

Align numbers with spaces

To align float number to the right use comma „,“ option before the colon. Type comma followed by a number of spaces, e.g. „0,10:0.0“ (this can be used only in String.Format method, not indouble.ToString method). To align numbers to the left use negative number of spaces.

[C#]

String.Format("{0,10:0.0}", 123.4567);    // "     123.5"

 String.Format("{0,-10:0.0}", 123.4567);   // "123.5     "

 String.Format("{0,10:0.0}", -123.4567);   // "    -123.5"

 String.Format("{0,-10:0.0}", -123.4567);  // "-123.5    "  

Custom formatting for negative numbers and zero

If you need to use custom format for negative float numbers or zero, use semicolon separator„;“ to split pattern to three sections. The first section formats positive numbers, the second section formats negative numbers and the third section formats zero. If you omit the last section, zero will be formatted using the first section.

[C#]

String.Format("{0:0.00;minus 0.00;zero}", 123.4567);   // "123.46"

 String.Format("{0:0.00;minus 0.00;zero}", -123.4567);  // "minus 123.46"

 String.Format("{0:0.00;minus 0.00;zero}", 0.0);        // "zero"  

Some funny examples

As you could notice in the previous example, you can put any text into formatting pattern, e.g. before an usual pattern „my text 0.0“. You can even put any text between the zeroes, e.g. „0aaa.bbb0“.

[C#]

String.Format("{0:my number is 0.0}", 12.3);   // "my number is 12.3" String.Format("{0:0aaa.bbb0}", 12.3);          // "12aaa.bbb3"  

See also

• [C#] String Format for Int – format (align) integer numbers
• [C#] String Format for DateTime – format date and time
• [C#] IFormatProvider for Numbers – format and parse float numbers using CultureInfo
• [C#] Custom IFormatProvider – string formatting with custom IFormatProvider
• [C#] Align String with Spaces – how to align text to the right or left
• [C#] Indent String with Spaces – how to indent text with repeated spaces

• MSDN Examples – MSDN examples for custom numeric formatting
• String.Format – MSDN – method to format strings
• Double.ToString – MSDN – formats double to string

Comparing two byte arrays in .NET

1	byte[] array1 = new byte[] { 1, 2, 3, 4 };

2	byte[] array2 = new byte[] { 1, 2, 3, 4 };

3

4	bool areEqual = array1.SequenceEqual(array2); //returns true

Simple concatenating byte arrays in .NET

byte[] combined = bytesOne.Concat(bytesTwo).Concat(bytesThree).ToArray();