Unable to view the WPF designer at design time - mvvm

Question

I’m unable view the designer at designtime after adding GalaSoft.MvvmLight(Runtime version v2.0.50727, version 0.0.0.0) and GalaSoft.MvvmLight.Extras(Runtime v2.0.50727, version 0.0.0.0) dlls. I am getting this exception at design time.
System.IO.FileLoadException Could not
load file or assembly
'GalaSoft.MvvmLight, Version=0.0.0.0,
Culture=neutral, PublicKeyToken=null'
or one of its dependencies. Operation
is not supported. (Exception from
HRESULT: 0x80131515) at
System.Reflection.RuntimeAssembly.nLoad(AssemblyName
fileName, String codeBase, Evidence
assemblySecurity, RuntimeAssembly
locationHint, StackCrawlMark&
stackMark, Boolean
throwOnFileNotFound, Boolean
forIntrospection, Boolean
suppressSecurityChecks) at
System.Reflection.RuntimeAssembly.nLoad(AssemblyName
fileName, String codeBase, Evidence
assemblySecurity, RuntimeAssembly
locationHint, StackCrawlMark&
stackMark, Boolean
throwOnFileNotFound, Boolean
forIntrospection, Boolean
suppressSecurityChecks) at
System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName
assemblyRef, Evidence
assemblySecurity, StackCrawlMark&
stackMark, Boolean forIntrospection,
Boolean suppressSecurityChecks) at
System.Reflection.Assembly.Load(AssemblyName
assemblyRef) at
MS.Internal.Package.VSIsolationProviderService.RemoteReferenceProxy.VsReflectionResolver.GetRuntimeAssembly(Assembly
reflectionAssembly) at
Microsoft.Windows.Design.Metadata.ReflectionMetadataContext.CachingReflectionResolver.GetRuntimeAssembly(Assembly
reflectionAssembly) at
Microsoft.Windows.Design.Metadata.ReflectionMetadataContext.Microsoft.Windows.Design.Metadata.IReflectionResolver.GetRuntimeAssembly(Assembly
reflectionAssembly) at
MS.Internal.Metadata.ClrAssembly.GetRuntimeMetadata(Object
reflectionMetadata) at
Microsoft.Windows.Design.Metadata.AttributeTableContainer.d_c.MoveNext()
at
Microsoft.Windows.Design.Metadata.AttributeTableContainer.GetAttributes(Assembly
assembly, Type attributeType, Func`2
reflectionMapper) at
MS.Internal.Metadata.ClrAssembly.GetAttributes(ITypeMetadata
attributeType) at
MS.Internal.Design.Metadata.Xaml.XamlAssembly.get_XmlNamespaceCompatibilityMappings()
at
Microsoft.Windows.Design.Metadata.Xaml.XamlExtensionImplementations.GetXmlNamespaceCompatibilityMappings(IAssemblyMetadata
sourceAssembly) at
Microsoft.Windows.Design.Metadata.Xaml.XamlExtensions.GetXmlNamespaceCompatibilityMappings(IAssemblyMetadata
source) at
MS.Internal.Design.Metadata.ReflectionProjectNode.BuildSubsumption()
at
MS.Internal.Design.Metadata.ReflectionProjectNode.SubsumingNamespace(Identifier
identifier) at
MS.Internal.Design.Markup.XmlElement.BuildScope(PrefixScope
parentScope, IParseContext context) at
MS.Internal.Design.Markup.XmlElement.ConvertToXaml(XamlElement
parent, PrefixScope parentScope,
IParseContext context,
IMarkupSourceProvider provider) at
MS.Internal.Design.DocumentModel.DocumentTrees.Markup.XamlSourceDocument.FullParse(Boolean
convertToXamlWithErrors) at
MS.Internal.Design.DocumentModel.DocumentTrees.Markup.XamlSourceDocument.get_RootItem()
at
Microsoft.Windows.Design.DocumentModel.Trees.ModifiableDocumentTree.get_ModifiableRootItem()
at
Microsoft.Windows.Design.DocumentModel.MarkupDocumentManagerBase.get_LoadState()
at
MS.Internal.Host.PersistenceSubsystem.Load()
at MS.Internal.Host.Designer.Load() at
MS.Internal.Designer.VSDesigner.Load()
at
MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedView.Load()
at
MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedDesignerFactory.Load(IsolatedView
view) at
MS.Internal.Host.Isolation.IsolatedDesigner.BootstrapProxy.LoadDesigner(IsolatedDesignerFactory
factory, IsolatedView view) at
MS.Internal.Host.Isolation.IsolatedDesigner.BootstrapProxy.LoadDesigner(IsolatedDesignerFactory
factory, IsolatedView view) at
MS.Internal.Host.Isolation.IsolatedDesigner.Load()
at
MS.Internal.Designer.DesignerPane.LoadDesignerView()
System.NotSupportedException An
attempt was made to load an assembly
from a network location which would
have caused the assembly to be
sandboxed in previous versions of the
.NET Framework. This release of the
.NET Framework does not enable CAS
policy by default, so this load may be
dangerous. If this load is not
intended to sandbox the assembly,
please enable the
loadFromRemoteSources switch. See
http://go.microsoft.com/fwlink/?LinkId=155569
for more information.
I am using .Net framework 4.0 ,WPF with c#.
Here my code
<Window x:Class="TreeviewApp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras"
xmlns:dataGrid="http://schemas.microsoft.com/wpf/2008/toolkit"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<DataTemplate x:Key="DetailTemplate">
<TextBlock Text="{Binding Swift_File_Name}"/>
</DataTemplate>
<HierarchicalDataTemplate x:Key="MasterTemplate"
ItemsSource="{ Binding SwiftCol,Mode=TwoWay}"
ItemTemplate="{StaticResource DetailTemplate}">
<HierarchicalDataTemplate.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Setter Property="IsSelected" Value="{Binding IsExpanded,Mode=TwoWay}"/>
</Style>
</HierarchicalDataTemplate.ItemContainerStyle>
<TextBlock Text="{Binding CITA_Info_Id}"/>
</HierarchicalDataTemplate>
<!--<Style TargetType="TreeViewItem">
<Setter Property="IsExpanded" Value="True" />
</Style>-->
　
　
　
　
<!--<Style x:Key="myStyle" TargetType="TreeViewItem">
<Setter Property="IsExpanded" Value="True" />
</Style>-->
</Window.Resources>
<Grid>
<Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="428,0,0,0" Name="button1" Command="{Binding btnClick}" VerticalAlignment="Top" Width="75" />
<TreeView Height="288" HorizontalAlignment="Left" Margin="18,23,0,0" VerticalAlignment="Top" Width="89"
x:Name="tvCita" ItemsSource="{Binding CitaCol,Mode=TwoWay}" ItemTemplate="{StaticResource MasterTemplate}">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="True"/>
</Style>
</TreeView.ItemContainerStyle>
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectedItemChanged">
<cmd:EventToCommand Command="{Binding TreeviewItemClick}" CommandParameter="{Binding SelectedItem, ElementName= tvCita, Mode=OneWay}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</TreeView>
<dataGrid:DataGrid Name="dgSwift" Margin="105,24,0,0" ItemsSource="{Binding Path = SwiftCol}" AutoGenerateColumns="False" CanUserAddRows="False">
<dataGrid:DataGrid.Columns>
<dataGrid:DataGridTextColumn Header="0000" Binding="{Binding Path = Line_0000_count}"></dataGrid:DataGridTextColumn>
<dataGrid:DataGridTextColumn Header="1000" Binding="{Binding Path = Line_1000_count}"></dataGrid:DataGridTextColumn>
<dataGrid:DataGridTextColumn Header="1100" Binding="{Binding Path = Line_1100_Count}"></dataGrid:DataGridTextColumn>
<dataGrid:DataGridTextColumn Header="1110" Binding="{Binding Path = Line_1110_count}"></dataGrid:DataGridTextColumn>
</dataGrid:DataGrid.Columns>
</dataGrid:DataGrid>
</Grid>
</
Window>
But, all the functionality is working fine. Please tell me how to fix this designer issue.

Answer 1

the error occur in event trigger function . the reason design is not available in the design time. also some error in datagrid check with this code
<Window x:Class="TreeviewApp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras"
xmlns:dataGrid="http://schemas.microsoft.com/wpf/2008/toolkit"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<DataTemplate x:Key="DetailTemplate">
<TextBlock Text="{Binding Swift_File_Name}"/>
</DataTemplate>
<HierarchicalDataTemplate x:Key="MasterTemplate"
ItemsSource="{ Binding SwiftCol,Mode=TwoWay}"
ItemTemplate="{StaticResource DetailTemplate}">
<HierarchicalDataTemplate.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Setter Property="IsSelected" Value="{Binding IsExpanded,Mode=TwoWay}"/>
</Style>
</HierarchicalDataTemplate.ItemContainerStyle>
<TextBlock Text="{Binding CITA_Info_Id}">
</TextBlock>
</HierarchicalDataTemplate>
</Window.Resources>
<Grid>
<Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="428,0,0,0" Name="button1" Command="{Binding btnClick}" VerticalAlignment="Top" Width="75" />
<TreeView Height="288" HorizontalAlignment="Left" Margin="18,23,0,0" VerticalAlignment="Top" Width="89" x:Name="tvCita" ItemsSource="{Binding CitaCol,Mode=TwoWay}" ItemTemplate="{StaticResource MasterTemplate}">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="True"/>
</Style>
</TreeView.ItemContainerStyle>
<!--<i:Interaction.Triggers>
--><!--<i:EventTrigger EventName="SelectedItemChanged">
<cmd:EventToCommand Command="{Binding TreeviewItemClick}" CommandParameter="{Binding SelectedItem, ElementName= tvCita, Mode=OneWay}"/>
</i:EventTrigger>--><!--
</i:Interaction.Triggers>-->
</TreeView>
<DataGrid Name="dgSwift" Margin="105,24,0,0" ItemsSource="{Binding Path = SwiftCol}" AutoGenerateColumns="False" CanUserAddRows="False">
<DataGrid.Columns >
<DataGridTextColumn Header="0000" Binding="{Binding Path = Line_0000_count}"></DataGridTextColumn>
<DataGridTextColumn Header="1000" Binding="{Binding Path = Line_1000_count}"></DataGridTextColumn>
<DataGridTextColumn Header="1100" Binding="{Binding Path = Line_1100_Count}"></DataGridTextColumn>
<DataGridTextColumn Header="1110" Binding="{Binding Path = Line_1110_count}"></DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>