Develop Reference

WF4.5- Expression Activity type 'CSharpValue`1' requires compilation in order to run

Background
What I'm trying to do is to have a scoped variable of one of my models in the xaml.
In my workflow project "MyProject.Workflows" I have created model classes, code activities and Xaml files. They are all under same namespace. In another project ("Engine"), I load and execute these workflows.
To load the workflows in the "Engine", I use ActivityXamlServices with ActivityXamlServicesSettings including CompileExpressions = true.
When loading the ActivityXamlServices, I use a XamlXmlReader with XamlXmlReaderSettings where I actually point to the "MyProject.Workflows" dll.
Since Both these projects are in the same solution I actually referred MyProject.Workflows in the "Engine".
Because Earlier, they were in different solutions, So when I tried to do this It gave me It cant find the "MyProject.Workflows" dll even though I point it in the XamlXmlReaderSettings.
Then I tried to load the dll to the app domain and then it worked.But I did not want to deal with App Domains so I decided to get both projects under one solution so I can refer the "MyProject.Workflows" in the "Engine".
Issue:
If I use one of those models inside of the Xaml as an expression like "Assign Activity" the Workflow isn't getting compiled when I try to execute this.
For example if I use this in an "Assign" activity having a scoped variable of type MyObject
Newtonsoft.Json.JsonConvert.DeserializeObject<MyProject.Workflows.Models.MyObject>(inputString);
I will get the below error message when I run the workflow.
NotSupportedException:'Expression Activity type 'CSharpValue`1' requires compilation in order to run. Please ensure that the workflow has been compiled.
If I remove these objects and just deal with strings or ints, it works fine.
Things I found in my research:
I found this was a bug in .Net Framework 4.5. But Im using 4.6
Even though I used CompileExpressions = true , I tried this compile method I found. But did not change a thing.
private static void Compile(DynamicActivity dynamicActivity)
{
TextExpressionCompilerSettings settings = new TextExpressionCompilerSettings
{
Activity = dynamicActivity,
Language = "C#",
ActivityName = dynamicActivity.Name.Split('.').Last() + "_CompiledExpressionRoot",
ActivityNamespace = string.Join(".", dynamicActivity.Name.Split('.').Reverse().Skip(1).Reverse()),
RootNamespace = null,
GenerateAsPartialClass = false,
AlwaysGenerateSource = true,
};
TextExpressionCompilerResults results =
new TextExpressionCompiler(settings).Compile();
if (results.HasErrors)
{
throw new Exception("Compilation failed.");
}
ICompiledExpressionRoot compiledExpressionRoot =
Activator.CreateInstance(results.ResultType,
new object[] { dynamicActivity }) as ICompiledExpressionRoot;
CompiledExpressionInvoker.SetCompiledExpressionRootForImplementation(
dynamicActivity, compiledExpressionRoot);
}
I read that some people faced this problem and they had to actually move the models to a diffrent namespace. I did that too. Didn't fix the problem.
My Xaml file has this entry added at the top.
xmlns:local="clr-namespace:MyProject.Workflows.Models"
Can someone please help me to get through this?

Show DevExpress waitform dialog without designer

I'm trying to display a Loading Please Wait dialog form using devex controls and I can't seem to do it. (using winforms, c#)
I'm using an older version of devex - not the latest. I can't do
SplashScreenManager.ShowDefaultWaitForm()
I need to do this in code without the designer.
1.
I tried:
SplashScreenManager.ShowForm(typeof(WaitDialogForm));
It looks right when it loads, but then it throws an error:
Unable to cast object of type 'DevExpress.Utils.WaitDialogForm' to type 'DevExpress.XtraSplashForm.SplashFormBase'
I tried:
SplashScreenManager.ShowForm(typeof(WaitForm));
This shows an empty form thats too big with no image and no text
I tried:
WaitDialogForm mWaitDialog = new WaitDialogForm() {Visible = false};
mWaitDialog.Show();
The wait form doesn't look right. There are white spaces instead of the image.
I tried:
WaitDialogForm mWaitDialog = new WaitDialogForm() {Visible = false};
mWaitDialog.ShowDialog();
The code doesn't continue executing.
I saw examples of
SplashScreenManager.ShowForm(typeof(WaitForm1));
I don't know how to do this without designer.
Can somebody please assist? I thought I'm doing something simple, but I can't seem to figure it out!

Probably this help u ;)
using (new DevExpress.Utils.WaitDialogForm("Please wait"))
{
//Do your stuff here
}

I don't know if this is in your 13.2 version but from looking at documentation you should be using ShowWaitForm instead of just ShowForm.
SplashScreenManager ssm = new SplashScreenManager();
ssm.ActiveSplashFormTypeInfo = typeof(WaitForm1);
ssm.ShowWaitForm();
If that does not work then i would just try preparing a working solution in the designer and then extracting the code from the designer.cs file.
Found a specific documentation example here

Attempted to read or write protected memory in a Windows Forms app

As a preface, I've looked at every StackOverflow question matched by searching for this error (25 of them or so), and none of them seemed to address the problem I'm having.
I'm building up a PermissionsDialog that inherits from System.Windows.Form. Within the method that calls dialogPermissions.ShowDialog() I am retrieving some Role objects from the database and loading them into a couple of ListBoxes. That was working just fine, but now I need to override one of the properties of the Role objects I'm adding to the listboxes using this pseudocode process:
iterate over the List of Roles
look up a matching item out of a List of Profiles using List<T>.Find()
look up a property on the Profile
build up a new Role and set the Name property as needed
add the Role to a list of Roles for the PermissionsDialog
All of that goes smoothly, but when I call dialogPermissions.ShowDialog() the underlying framework code throws an AccessViolationException.
Here is what I believe to be the relevant code:
List<UserProfile> userProfiles = new List<UserProfile>();
List<Role> allRoles = new List<Role>();
dialogData.AllRoles = new List<Role>();
using (var objectContext = this.SiteContext.CreateObjectContext())
{
userProfiles = rs.UserProfiles.FindAll().ToList();
allRoles = rs.Roles.FindAll();
}
foreach (Role role in allRoles.Where(role => role.BuiltInId == (int)BuiltInRoleId.UserProfileRole)) {
var userProfile = userProfiles.Find(up => role.Id == up.Id);
var roleToAdd = new Role {
BuiltInId = role.BuiltInId,
Description = role.Description,
DirectoryEntry = role.DirectoryEntry,
Id = role.Id,
IsBuiltInRole = role.IsBuiltInRole,
Name = null != profile ? profile.DisplayName:role.Name
};
dialogData.AllRoles.Add(roleToAdd);
}
My suspicion is that this is somehow a deferred execution issue, but triggering execution by calling ToList() on dialogData.AllRoles before calling ShowDialog() doesn't resolve the issue. When I replace profile.DisplayName with a constant string I do not get the error.
Any clues what's going on under the covers here, or how to find out what's going on, or how to approach the problem differently so I can avoid it? All suggestions welcome ;-)
CONCLUSION
So here's the actual issue, I think:
Setting the Name property of the Role to null is just fine, but when the dialog tries to create a ListBoxItem out of the Role and uses the Role.Name property for the ListBoxItem's Content property (which is an Object), that can't be set as null and throws down in the framework code that's building up the dialog. Checking to make sure I had a value in there fixes the issue.
Seems like s strange exception to throw, but there you have it....

You test for profile != null, but don't test for profile.DisplayName != null so that's the first thing that comes to mind from just looking at your sample.
Standard exception finder is to go to Debug\Exceptions and check the box for break on thrown so you can see all the state when the exception is thrown.

You can stare at this code for a week and never find the reason for the AccessViolationException. Managed code does not die from processor faults like this one.
You'll need to dig out as much info you can get from the actual exception. That requires first of all that you enable unmanaged code debugging so that you can see the stack frames in the native code. Project + Properties, Debug tab, tick the "Enabled unmanaged code debugging" option.
Next, you want to make sure that you have .pdb file for any of the native Windows DLLs. Including the ones for Active Directory, somewhat suspect in this case. Tools + Options, Debugging, Symbols and enable the Microsoft Symbol Server. Press F1 if you have an older version of Visual Studio that doesn't make it a simple checkbox click.
Reproduce the crash, the call stack should give you a good hint what native code is suspect. Post it in your question if you can't make hay of it.

Calling javascript from codebehind c# & Asp.Net

Am unable to understand why Cannot the below javascript code is not called from code behind
I have a simple javascript block like this
function callsCox(res) {
alert(res);
}
From my code behind :
....
string res="COX23";
string script = String.Format("callsCox({0})", res);
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "Cox",script,true);
Am I missing anything? There aren't any exceptions or errors.

Page.ClientScript.RegisterStartupScript looks OK to me (might have missed something). Things to try
Add apostrophes to the call - it's coming through as an object. Try as a string
string script = String.Format("callsCox('{0}')", res);
Is the string script Page.ClientScript.RegisterStartupScript being called after an update panel partial postback. That could effect it
I have know functions not been found if they are in the same page. Try moving to an external js file. Don't asked me why this has resolved issues but it has a couple of times in the past for me.
Just for debug purposes take the function out of the equation all together, Try to get the alert working like this. It will at least isolate the problem if it does work
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "Cox","alert('Does this work?')",true);
View the source of the page. Is the function even written into the page (or alert from point 4). It should be. If you put a breakpoint on the this.Page.ClientScript.RegisterStartupScript method is it being hit? Seems like it might not be.
Apologies for not giving you a 'hey this is the solution' type of answer. I've had stuff like this in the past and I've found it a matter of stripping things down until the problem has been isolated. Someone else may be able to spot an immediate problem of course. Good luck.

This works for me:
public static void ShowAlert(Page page, String message)
{
String Output;
Output = String.Format("alert('{0}');",message);
page.ClientScript.RegisterStartupScript(page.GetType(), "Key", Output, true);
}

Windows Service Webbrowser object invalid cast exception error

I'm having a bit of trouble with a Windows Service webbrowser object. It's attempting to load in values of username and password to a site but keeps failing and throwing the following error:
System.InvalidCastException: Specified cast is not valid.
at System.Windows.Forms.UnsafeNativeMethods.IHTMLDocument2.GetLocation()
at System.Windows.Forms.WebBrowser.get_Document()
at MyWindowsService.MyDataProcessor.login()
The code that I'm using to make this call is:
MyWebBrowser.Document.All["Login"].SetAttribute("Value", username);
MyWebBrowser.Document.All["Password"].SetAttribute("Value", password);
MyWebBrowser.Document.All["submit"].InvokeMember("Click");
Any ideas as to why it keeps failing? Thanks in advance for the help.

I'm not sure if this solves the problem, but you can check InvokeRequired property on the current object, or WebBrowser.InvokeRequired, and use something like MethodInvoker to call your function or a helper function to access WebBrowser.Document.
http://www.megasolutions.net/cSharp/(WebBrowser_Document-==-null)-throws-InvalidCastException-43126.aspx

I had a similar problem using SHDocVW.WebBrowserClass. I got an InvalidCastException when I tried to access Document.all from an instance of SHDocVW.WebBrowserClass (from the main thread) and I was able to fix it by casting to IHTMLDocument2 instead of HTMLDocument. This took me a long time to figure out because casting to HTMLDocument works most of the time.
SHDocVW.WebBrowserClass Explorer = [instance of IE];
((IHTMLDocument2)Explorer.Document).all // works all the time
((HTMLDocument)Explorer.Document).all // works some times
I hope this helps someone.