custom controls in WPF and their use

There are 3 main steps:

1. First create a custom control that inherits the TextBox

namespace ezintepark.presentation.common{//<summary>//////digital box, inheriting text box, digital input only, extended Value (decimal)//</sum            Mary> public class Exnumericbox:textbox {#region Dependency properties public int Digits {            get {return (int) GetValue (digitsproperty);}        set {SetValue (Digitsproperty, value);} } public static readonly DependencyProperty Digitsproperty = Dependencyproperty.register ("Digits", typeof (int), Typ        EOF (Exnumericbox), New PropertyMetadata (2));            Public decimal Value {get {return (decimal) GetValue (valueproperty);}        set {SetValue (Valueproperty,value);} } public static readonly DependencyProperty Valueproperty = Dependencyproperty.register ("Value", typeof (decimal), t Ypeof (Exnumericbox), New PropertyMetadata (decimal.               Zero)); #endregion public Exnumericbox (): Base () {this. Verticalcontentalignment = Verticalalignment.center This.        TextChanged + = new Textchangedeventhandler (numericbox_textchanged);        } private String backupstring = ""; <summary>/////</summary>/<param name= "sender" ></param>//        /<param name= "E" ></param> private void Numericbox_textchanged (object sender, Textchangedeventargs e)            {TextBox TB = (textbox) sender; String temp = tb.            Text.trim (); if (!isdecimal (temp)) {//revert string TB.                Text = backupstring; Tb.                Select (backupstring.length, 0);            Return            } decimal tempvalue = 0;            Decimal.tryparse (temp, out tempvalue);            backupstring = temp;        Value = Tempvalue; }//<summary>//whether digital///</summary>//<param name= "source" ></param&        Gt <returns></returns> BOOLIsdecimal (String source) {foreach (char item in source) {if (item < ' 0 ' ||                    Item > ' 9 ') {if (Digits = = 0) return false;                        if (Digits! = 0 && Item! = ')                return false;        }} return true; }    }}

2. When you want to use the control in the window or UserControl class, first introduce a namespace, such as:

3. Use the control

        <common:exnumericbox x:name= "Tbfirstcost" horizontalalignment= "left" height= "All" margin= "38,4,0,4" TextWrapping= "Wrap" verticalalignment= "center" width= "verticalcontentalignment=" center "grid.column=" 1 "/>

　　

custom controls in WPF and their use