c# - How to set Data Source In Crystal Report from View Model in MVVM pattern WPF Application -

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below code setting document in view model

    reportdocument report = new reportdocument();             report.load("reports/test.rpt");             var data_ = db.det_qualificationmaster.where(x => x.mua_id == 6)                 .select(x => new { x.collagename, x.startyear, x.endyear                             }).tolist();              report.setdatasource(data_);

code in page 

  <viewer:crystalreportsviewer horizontalalignment="left" name="crystalreportsviewer1"                                    verticalalignment="top" height="400" width="400" >

how can bind data view model page

i found solution myself thought share all.big thank andre-alves lima blog here's link http://www.andrealveslima.com.br/blog/index.php/2016/07/20/utilizando-o-crystal-reports-com-mvvm-no-wpf/

it's in portuguese translate i'm putting code below

add static class reportsourcebehaviour.cs 

public static class reportsourcebehaviour     {         public static readonly system.windows.dependencyproperty reportsourceproperty =             system.windows.dependencyproperty.registerattached(                 "reportsource",                 typeof(object),                 typeof(reportsourcebehaviour),                 new system.windows.propertymetadata(reportsourcechanged));          private static void reportsourcechanged(system.windows.dependencyobject d, system.windows.dependencypropertychangedeventargs e)         {             var crviewer = d sapbusinessobjects.wpf.viewer.crystalreportsviewer;             if (crviewer != null)             {                 crviewer.viewercore.reportsource = e.newvalue;             }         }          public static void setreportsource(system.windows.dependencyobject target, object value)         {             target.setvalue(reportsourceproperty, value);         }          public static object getreportsource(system.windows.dependencyobject target)         {             return target.getvalue(reportsourceproperty);         }     }

in viewmodel

public class mainviewmodel {     public crystaldecisions.crystalreports.engine.reportdocument report { get; set; }      public mainviewmodel()     {         report = new nameofrptfile();         //add data report     } }

in page (xaml)

<window xmlns:viewer="clr-namespace:sapbusinessobjects.wpf.viewer;assembly=sapbusinessobjects.wpf.viewer"  x:class="crystalwpfmvvm.mainwindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:local="clr-namespace:crystalwpfmvvm"         title="mainwindow" height="350" width="525"         datacontext="{staticresource mainviewmodel}">     <grid>         <viewer:crystalreportsviewer x:name="crystalreportsviewer"                                      local:reportsourcebehaviour.reportsource="{binding path=datacontext.report, relativesource={relativesource mode=findancestor, ancestortype=frameworkelement}}"/>     </grid> </window>




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