c# - Getter for a byte[] object returning an Image object -

i have database property of binary type. i'd able insert byte arrays database , pull them out , display images. way have code set able convert byte[] image in getter method in hope that, make image display.

the code have runs is:

[propertydefinition("0b79c12f-21f4-4eca-bf4f-e694b9de73db")] [display(name = "computer_agentlastcontactedicon", description = "computer_agentlastcontactedicon_desc", order = 5, resourcetype = typeof(entitymetadatastrings))] public byte[] agentlastcontactedicon { get; set; } 

the problem though displays "system.byte[]" in datagrid instead of image.

in attemt display image changed getter , setter methods following:

[propertydefinition("0b79c12f-21f4-4eca-bf4f-e694b9de73db")] [display(name = "computer_agentlastcontactedicon", description                                       = "computer_agentlastcontactedicon_desc", order = 5, resourcetype = typeof(entitymetadatastrings))] public byte[] agentlastcontactedicon; public image _agentlastcontactedicon {         {         memorystream ms = new memorystream(agentlastcontactedicon);         image img = image.fromstream(ms);         return img;     }     set     {         imageconverter converter = new imageconverter();         byte[] array = (byte[])converter.convertto(value, typeof(byte[]));         agentlastcontactedicon = array;     } } 

i getting error though: "attribute 'propertydefinition' not valid on declaration type. valid on 'property, indexer' declarations."

following advice found on post on stack overflow, moved "public byte[] agentlastcontactedicon;" above:

public byte[] agentlastcontactedicon;  [propertydefinition("0b79c12f-21f4-4eca-bf4f-e694b9de73db")] [display(name = "computer_agentlastcontactedicon", description = "computer_agentlastcontactedicon_desc", order = 5, resourcetype = typeof(entitymetadatastrings))]             public image _agentlastcontactedicon {         {         memorystream ms = new memorystream(agentlastcontactedicon);         image img = image.fromstream(ms);         return img;     }     set     {         imageconverter converter = new imageconverter();         byte[] array = (byte[])converter.convertto(value, typeof(byte[]));         agentlastcontactedicon = array;     } } 

however doing gave me error: "the associated metadata type type 'x' contains following unknown properties or fields: _agentlastcontactedicon. please make sure names of these members match names of properties on main type.

i'm using following silverlight display items in database:

<ctrls:customdatagrid     x:name="computersdatagrid"     grid.row="1"     style="{staticresource datagridstyle}"     itemssource="{binding itemssource}"     selecteditem="{binding selecteditem, mode=twoway}"     selectionmode="{binding selectionmode}"     propertydefinitions="{binding propertydefinitions}" /> 

thanks ahead of time help!

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thank great advice implement converter. i'm having bit of trouble getting working though. im trying here convert string string see work. here sample converter:

    using system;     using system.collections.generic;     using system.linq;     using system.net;     using system.windows;     using system.globalization;     using system.windows.data;      namespace ias.shared.web.resources     { [valueconversion(typeof(string), typeof(string))] public class imageconverter : ivalueconverter {     public object convert(object value, type targettype, object parameter, cultureinfo culture)     {         string str = (string)value;         str = "changed";         return str;     }     public object convertback(object value, type targettype, object parameter, cultureinfo culture)     {         string str = (string)value;         str = "changedback";         return str;     } } 

}

i try use in .xaml file here:

    xmlns:converter="clr-namespace:accessdata.ias.shared.web.resources" 

here:

    <usercontrol.resources>     <converter:imageconverter x:key="imageconverter" /> 

and here:

    <ctrls:customdatagrid x:name="computersdatagrid"                        grid.row="1"                        style="{staticresource datagridstyle}"                        itemssource="{binding itemssource, converter={staticresource imageconverter}}"                        selecteditem="{binding selecteditem, mode=twoway}"                        selectionmode="{binding selectionmode}"                        propertydefinitions="{binding propertydefinitions}"> 

my string doesn't change though. getting buid errors "the type 'converter:imageconverter' not found. verify not missing assembly reference , referenced assemblies have been built" , "the tag 'imageconverter' not exist in xml namespace 'clr-namespace:ias.shared.wen.resources'". however, if build again, runs. see issues code may preventing converter changing string? thanks, again!

converting byte[] image inside of getter bad idea. may costly operation , properties meant relatively simple, pass-through style access perhaps error checking or internal state management.

instead, how defining simple converter job you? can bind byte[] property, use converter convert image.