Convert sorting in Silverlight

1. Convert to true. False is used to bind the ischecked attribute similar to that in the checkbox:

Public class boolconverter: ivalueconverter <br/>{< br/> Public object convert (object value, type targettype, object parameter, cultureinfo Culture) <br/>{< br/> string S = (string) value; <br/> bool B; <br/> If (S = NULL | S. trim (). length = 0 | S = "0") <br/> B = false; <br/> else <br/> B = true; <br/> return B; <br/>}< br/> Public object convertback (object value, type targettype, object Pa Rameter, cultureinfo culture) <br/>{< br/> string strvalue = (bool) value? "1": "0"; <br/> return strvalue; <br/>}< br/>}

 

Ii. Time String Conversion

# Region is a date definition converter <br/> // defines a conversion class and is referenced as a resource on the page <br/>/* <br/> * ivalueconverter-value conversion interface, converts a value of one type to a value of another type. It provides a way to apply custom logic to binding <br/> * convert-Forward Converter. When you pass the value from the data source to the binding target, the Data Binding engine calls this method <br/> * convertback-reverse converter. When you pass a value from the bound destination to the data source, the Data Binding engine calls this method <br/> */<br/> // <summary> <br/> // forward converter. When you pass the value from the data source to the bound destination, the Data Binding engine calls this method <br/> /// </Summary> <br/> /// <Param name = "value"> value before conversion </Param> <br/> /// <Param name = "targettype"> converted type </param> <br/> /// <Param name = "parameter"> Converter parameters Used </param> <br/> // <Param name = "culture"> region information used by the converter </param> <br/> /// <returns> converted value </returns> <br/> public class datetimeconverter: ivalueconverter <br/>{< br/> Public object convert (object value, <br/> type Ta Rgettype, <br/> object parameter, <br/> cultureinfo culture) <br/>{< br/> datetime date = (datetime) value; <br/> return date. tostring ("yyyy-mm-dd"); <br/>}< br/> /// <summary> <br/> // reverse converter. When you pass a value from the bound destination to the data source, the Data Binding engine calls this method <br/> /// </Summary> <br/> /// <Param name = "value"> value before conversion </Param> <br/> /// <Param name = "targettype"> converted type </param> <br/> /// <Param name = "parameter"> Converter parameters Used </param> <br/> // <Param name = "culture"> region information used by the converter </param> <br/> /// <returns> converted value </returns> <br/> Public object convertback (object value, <br/> type targettype, <br/> object parameter, <br/> cultureinfo culture) <br/>{< br/> string strvalue = value. tostring (); <br/> datetime resultdatetime; <br/> If (datetime. tryparse (strvalue, out resultdatetime) <br/>{< br/> return resultdatetime; <br/>}< br/> return value; <br/>}< br/> # endregion

The usage is as follows:

First, add the following statement to the page for conversion:

Xmlns: Local = "CLR-namespace: XXX" // XXX is the namespace of your Silverlight project.

Then add:

<Usercontrol. Resources>
<Local: datetimeconverter X: Key = "datetimeconverter"/>

<Local: boolconverter
X: Key = "boolconverter
"/>

</Usercontrol. Resources>

<Checkbox X: Name = "CHK1" content = "I am checkbox" ischecked = "{binding database table field, convert = {staticresource boolconverter}" margin = "5"/>

Iii. Image Source attribute binding

Define a converter iconconverter class

// The icon is of the source type and the imagesource is of the target type.
[Valueconversion (typeof (icon), typeof (imagesource)]
// Inherits ivalueconverterpublic class iconconverter: ivalueconverter {public object convert (object value, type targettype, object parameter, cultureinfo culture) {icon = (icon) value; Bitmap bitmap = icon. tobitmap (); intptr hbitmap = bitmap. gethbitmap (); imagesource bitmapsource = imaging. createbitmapsourcefromhbitmap (hbitmap, intptr. zero, int32rect. empty, bitmapsizeoptions. fromemptyoptions ()); Return bitmapsource;} // The following function is used to implement the inverse operation of the preceding conversion, here we do not need to change imagesource to an icon, so we did not write a specific implementation of public object convertback (object value, type targettype, object parameter, cultureinfo culture) {Throw new notimplementedexception ();}} finally, rebind the data. 1. Add reference: xmlns: Local = "CLR-namespace: namespace of the converter" 2. Add Resource: <local: iconconverter X: key = "iconconverter"/> 3. Bind the converter data: <Image Source = "{binding Path = menuicon, converter = {staticresour Ce iconconverter }}"/> OK. The problem is fixed.