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I guess you have to ask yourself why you are dynamically loading instead of simply including a reference in the project. DLL hell all over again.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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I want to create plugin based system where I can exchange or add new functionality to my application just by putting a bunch of dll into plugin location.
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If you're the only user, seems pointless; if you plan to distribute it, chances are the target environment won't allow it (for whatever reason), or they'll mess up the installation / maintenance.
Windows deals in "packages" once you're out of the wild.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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koirat wrote: Or how can I load all dependent assemblies when my assembly is loaded.
Assembly.GetReferencedAssemblies Method (System.Reflection) | Microsoft Docs[^]
Load those, and their dependencies before loading you assembly. Requires reflection and recursion.
Bastard Programmer from Hell 
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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Not good enough I need my assembly to load it's dependencies by itself. I don't want to do anything in my main application except loading particular dll.
Right now I have tried static class with AssemblyResolver event subscribed in constructor but it never gets called.
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koirat wrote: Not good enough I need my assembly to load it's dependencies by itself.
It's a programming language; things don't happen by themselves.
MS Access hides complexity; try that.
--edit
It just takes a few lines of code to do it by "itself", and requires actual programming. And I is for sale 
Bastard Programmer from Hell
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
modified 8-Sep-20 16:54pm.
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Actually they do. I was able to pull it out in the end.
public static class AssemblyResolver
{
public static HashSet<Assembly> SupportedRequestors { get; set; } = new HashSet<Assembly>();
static AssemblyResolver() {
SupportedRequestors.Add(typeof(AssemblyResolver).Assembly);
}
public static void Initialize() {
AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;
}
private static Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args) {
if (SupportedRequestors.Contains(args.RequestingAssembly)) {
AssemblyName assemblyName = new AssemblyName(args.Name);
string assemblyPath = Path.Combine(Path.GetDirectoryName(args.RequestingAssembly.Location),assemblyName.Name+".dll");
Assembly loadedAssembly = Assembly.LoadFile(assemblyPath);
SupportedRequestors.Add(loadedAssembly);
return loadedAssembly;
}
return null;
}
}
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I have the following table, i can join this table to others to build a bigger dataset but I only wnat to run one query to get the data and then build a data model shown below. I can build a Single model but i want to do more like a JSON serialization.
Can anybody show me a LINQ or other method that would be efficient and could be expanded to use generics?
Thanks
Madaxe
School Class Student
Bakers 19A Bob
Bakers 19A Jim
Bakers 17A Gary
Bakers 17A Stuart
DataClass
IEnumerable<schoolclass> Schools
SchoolClass
IEnumerable<studentclass> Classes
StudentClass
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I found this one example is this the best method / approach?
<pre>namespace ConsoleApp3
{
class Program
{
static void Main(string[] args)
{
List<Customer> CustomerList = new List<Customer>();
CustomerList.Add(new Customer { ID = 1, Name = "One", GroupID = 1 });
CustomerList.Add(new Customer { ID = 2, Name = "Two", GroupID = 1 });
CustomerList.Add(new Customer { ID = 3, Name = "Three", GroupID = 2 });
CustomerList.Add(new Customer { ID = 4, Name = "Four", GroupID = 1 });
CustomerList.Add(new Customer { ID = 5, Name = "Five", GroupID = 3 });
CustomerList.Add(new Customer { ID = 6, Name = "Six", GroupID = 3 });
IEnumerable<CustomerGrouping> CustomerGroupings = CustomerList.GroupBy(u => u.GroupID)
.Select(group => new CustomerGrouping { GroupID = group.Key, Customers = group.ToList() })
.ToList();
}
}
public class Customer
{
public int ID { get; set; }
public string Name { get; set; }
public int GroupID { get; set; }
}
public class CustomerGrouping
{
public int GroupID { get; set; }
public IEnumerable<Customer> Customers { get; set; }
}
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mjeeves wrote: s this the best method / approach
It all depends on what you are trying to achieve.
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<pre>namespace ConsoleApp3
{
class Program
{
static void Main(string[] args)
{
List<SignInReport> SignInReports = new List<SignInReport>();
SignInReports.Add(new SignInReport { UserName = "Bob", EventName = "SignIn", EventTime = new DateTime(2020,1,18,6,0,0) });
SignInReports.Add(new SignInReport { UserName = "Bob", EventName = "SignOut", EventTime = new DateTime(2020, 1, 18, 10, 0, 0) });
SignInReports.Add(new SignInReport { UserName = "Bob", EventName = "SignIn", EventTime = new DateTime(2020, 1, 18, 11, 30, 0) });
SignInReports.Add(new SignInReport { UserName = "Bob", EventName = "SignOut", EventTime = new DateTime(2020, 1, 18, 16, 30, 0) });
SignInReports.Add(new SignInReport { UserName = "Charlie", EventName = "SignIn", EventTime = new DateTime(2020, 1, 18, 6, 0, 0) });
SignInReports.Add(new SignInReport { UserName = "Charlie", EventName = "SignOut", EventTime = new DateTime(2020, 1, 18, 15, 30, 0) });
SignInReports.Add(new SignInReport { UserName = "Charlie", EventName = "SignIn", EventTime = new DateTime(2020, 1, 19, 6, 30, 0) });
SignInReports.Add(new SignInReport { UserName = "Charlie", EventName = "SignOut", EventTime = new DateTime(2020, 1, 19, 17, 45, 0) });
IEnumerable<SignInReportGrouping> SignInData = SignInReports.GroupBy(u => u.UserName)
.Select(group => new SignInReportGrouping { UserName = group.Key,
SignInReports = group.ToList() })
.ToList();
}
}
public class SignInReport
{
public string UserName { get; set; }
public string EventName { get; set; }
public DateTime EventTime { get; set; }
}
public class SignInReportGrouping
{
public string UserName { get; set; }
public IEnumerable<SignInReportDay> SignInReportDay { get; set; }
}
public class SignInReportDay
{
public IEnumerable<SignInReport> SignInReports { get; set; }
}
}
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Since you're using Linq-to-Objects, that's simple enough to do:
IEnumerable<SignInReportGrouping> SignInData = SignInReports
.GroupBy(u => u.UserName)
.Select(user => new SignInReportGrouping
{
UserName = user.Key,
SignInReportDay = user
.GroupBy(u => u.EventTime.Date)
.Select(day => new SignInReportDay
{
Day = day.Key,
SignInReports = day.ToList(),
})
.ToList(),
})
.ToList(); You'll probably want to add the Day property to your SignInReportDay class so you know which day it represents:
public class SignInReportDay
{
public DateTime Day { get; set; }
public IEnumerable<SignInReport> SignInReports { get; set; }
}
NB: If you're using Entity Framework 6, you probably won't be able to use the .Date property. For EF6, use DbFunctions.TruncateTime:
.GroupBy(u => DbFunctions.TruncateTime(u.EventTime)) For EF Core, the .Date property should work correctly.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I have a custom font. The font contains symbols at specific addresses. I want to display one of the symbols in a TextBlock.
The font (ttf-file) is located in my applications's folder: Fonts.
I have included the font in the application and set the BuildAction to Resource.
I have verified the font's name (not file name) to reference it in my code.
I have verified which "address" the symbol should be fetched from in the font.
I have tried this both in XAML and with C#. But it won't work.
XAML
<Window x:Class="Main.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Main"
mc:Ignorable="d"
Loaded="Window_Loaded"
Title="MainWindow" Height="450" Width="800">
<Window.Resources>
<Style x:Key="Foo">
<Setter Property="TextElement.FontFamily" Value="pack://application:,,,/Main;component/Fonts/#MyFont" />
</Style>
</Window.Resources>
<StackPanel Orientation="Vertical">
<TextBlock Text="&#x E905;" Style="{StaticResource Foo}" />
<TextBlock FontFamily="Segoe MDL2 Assets" Text="&#x E777;" />
<TextBlock x:Name="txt1" />
<TextBlock x:Name="txt2" />
</StackPanel>
</Window>Notice: Never mind the space in the middle of "address" for the first and second TextBlock. The code-view here at CodeProject failes to display the address. It tries, and fails, to fetch the correct symbols by that address - if I remove the space in the addresses...
C#
Here is the handler for the Loaded event:
private void Window_Loaded(object sender, RoutedEventArgs e)
{
txt1.FontFamily = new FontFamily("pack://application:,,,/Main;component/Fonts/#MyFont");
txt1.Text = "\xe905";
txt2.FontFamily = new FontFamily("Segoe MDL2 Assets");
txt2.Text = "\xe7777";
}Result
The result are displayed in the four TextBlocks. From top to bottom:
* First: This fails. I get an empty rectangle, like these rectangles.
* Second: This line works. You should be able to copy this line into your own application with success.
* Third: Same as the first TextBlock. An empty rectangle.
* Forth: This "works". I get the correct symbol as well as an empty rectangle.
What could be the problem?
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As far as I can see, you can't use a full pack: URI to reference an embedded font:
In order to reference font resource items from code, you must supply a two-part font resource reference: the base uniform resource identifier (URI); and the font location reference.
If it's a single application, try using ./Fonts/#MyFont from XAML, and new FontFamily(new Uri("pack://application:,,,/Fonts/"), "./#MyFont") from code.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thanks for the reply.
Unfortunately it didn't work. Changing the syntax for the reference of the Font didn't solve the problem. Thanks for suggesting that anyway. It was worth a try.
For this question I have created a simple application where the Fonts are stored in the same project as my executable. I can reproduce the error in this small application for myself and to post in this forum.
In my real project I have all this is in a WPF User Control Library. That is way I have the exact path to the font with the assembly reference.
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Show the code you tried; maybe you didn't get it right.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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I have tried this:
<Window.Resources>
<Style x:Key="Foo">
<Setter Property="TextElement.FontFamily" Value="pack://application:,,,/Main;component/Fonts/#MyFont" />
</Style>
<Style x:Key="Bar">
<Setter Property="TextElement.FontFamily" Value="./Fonts/#MyFont" />
</Style>
<FontFamily x:Key="Baz">./Fonts/#MyFont</FontFamily>
</Window.Resources>
<StackPanel Orientation="Vertical">
<TextBlock Text="" Style="{StaticResource Foo}" />
<TextBlock Text="" Style="{StaticResource Bar}" />
<TextBlock Text="" FontFamily="{StaticResource Baz}" />
<TextBlock FontFamily="Segoe MDL2 Assets" Text="" />
<TextBlock x:Name="txt1" />
<TextBlock x:Name="txt2" />
</StackPanel>
In the code, I have tried these different ways to set the FontFamily property. I have just listed them here. But have run them separately. All failed...
private void Window_Loaded(object sender, RoutedEventArgs e)
{
txt1.FontFamily = new FontFamily("pack://application:,,,/Main;component/Fonts/#MyFont");
txt1.FontFamily = new FontFamily(new Uri("pack://application:,,,/Fonts/"), "./#MyFont");
txt1.FontFamily = new FontFamily("MyFont");
txt1.Text = "\xe905";
}Notice the txt1.FontFamily = new FontFamily("MyFont");
I have installed the font from it's ttf-file.
If I open the Character map application in Windows I can see all symbols that I require.
I just can't understand what is going on...
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I have solved it!
It was the darn TTF-file which was the problem.
When I changed to another font, the XAML-code worked straight away!
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Previously when debugging my program would stop if an error occured, this no longer works.
Now I have to hunt down the error which takes hours sometimes.
Is there an option / setting I can change in order to stop on the error as it occurs.
I appreciate any help.
Thanks in advance.
Michael
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Debuggers don't "stop on errors" they stop either because they hit a breakpoint you set, or an exception occurs that you aren't handling (or that is in the "break on this exception" list your project has set).
It's worth checking two things:
1) That you are actually running your app in the debugger. Yes, yes - I know that's obvious. But you'd be surprised how many people ignore the obvious ... 
2) That you haven't switched exceptions off: Go to "Debug...Windows...Exception Settings" and check that "Common Language Runtime Exceptions" is a solid black.
But logic errors in your code the debugger won't automatically stop on - it has no idea what you are trying to do, so it can't! (But you knew that anyway ...)
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
modified 7-Sep-20 12:04pm.
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OriginalGriff wrote: an exception occurs that you aren't handling (and that is in the "break on this exception" list your project has set)
The "break on this exception" setting overrides the unhandled part. You use it to break on exceptions which are handled in code. The debugger will always break on unhandled exceptions.
Manage exceptions with the debugger - Visual Studio | Microsoft Docs[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Monday morning mode ... 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I have hundred of DataTables and many of the caption names within do not match the column name.
Is there a way I can change all captions to match column name.he follows code I tried.
foreach (DataTable dt in dataSet.Tables)
{
foreach (DataColumn dc in dt.Columns)
{
if (dc.DataType == typeof(string))
{
dc.Caption = dc.ColumnName.ToString();
}
}
}
'
However this is not permanent and I don't see results.
Is there a way to make this permanent.
I appreciate any help and thanks in advance.
Michael
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The Caption property isn't used to set the headers of a DataGridView (for example) when you use it as a DataSource - it probably should have been, but it definitely wasn't!
If you want a "friendly name" for your displayed columns, you need to manually set them on the display control via the "HeaderText" property:
myDataTable = new DataTable();
myDataTable.Columns.Add("C1");
myDataTable.Columns.Add("C2");
myDataTable.Columns[0].Caption = "A new caption";
myDataGridView.Columns.Clear();
myDataGridView.DataSource = myDataTable;
for (int i = 0; i < myDataTable.Columns.Count; i++)
{
myDataGridView.Columns[i].HeaderText = myDataTable.Columns[i].Caption;
}
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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