Error CS0246: The type or namespace name 'Color' could not be found

fharreaufharreau
in FastReport .NET

I am migrating an application from .NET Framework 4.6.1 to .NET Core 3.1. I added the following nuget reference to the new project: FastReport.OpenSource - 2019.2.0 (to match the version of dlls used in the old project)


Everything works fine, the code compiles easily, until I ran the code and hit the report.Prepare(true); instruction. I get the following error:

(102,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(108,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(114,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(120,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(126,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(132,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(138,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(144,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(150,18): Error CS0246: The type or namespace name 'Color' could not be found (are you missing a using directive or an assembly reference?)

(104,15): Error CS0103: The name 'Color' does not exist in the current context

(110,15): Error CS0103: The name 'Color' does not exist in the current context

(116,15): Error CS0103: The name 'Color' does not exist in the current context

(122,15): Error CS0103: The name 'Color' does not exist in the current context

(128,15): Error CS0103: The name 'Color' does not exist in the current context

(134,15): Error CS0103: The name 'Color' does not exist in the current context

(140,15): Error CS0103: The name 'Color' does not exist in the current context

(146,15): Error CS0103: The name 'Color' does not exist in the current context

(152,15): Error CS0103: The name 'Color' does not exist in the current context

(70,29): Error CS0012: The type 'Color' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Drawing.Primitives, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

(76,26): Error CS0012: The type 'Color' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Drawing.Primitives, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

(77,26): Error CS0012: The type 'Color' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Drawing.Primitives, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

(80,26): Error CS0012: The type 'Color' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Drawing.Primitives, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

(81,26): Error CS0012: The type 'Color' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Drawing.Primitives, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

(84,26): Error CS0012: The type 'Color' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Drawing.Primitives, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

(85,26): Error CS0012: The type 'Color' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Drawing.Primitives, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

(85,38): Error CS0103: The name 'Color' does not exist in the current context


Here is the code:

using var report = new Report();
using var reportTemplate = new MemoryStream(Resources.ReportFile); // Our CustomReport.frx

report.Load(reportTemplate);

// Setting some parameters
report.SetParameterValue([..]);

// Registering some data
report.RegisterData([..])

report.Prepare(true);


The frx file contains, in its script part, 9 custom defined colors, like this:

 public static Color ErrorAlarm{
     get{
       return Color.FromArgb(255, 48, 48);
     }
   }

So I suspect the issue is probably linked to this. But I don't understand why FastReport is complaining about System.Drawing.Primitives, since it exists in .NET Core 3.1...


I also tried to upgrade the FastReport.OpenSource to newer versions (including the last one), but I always get either the same error or a NullReferenceException, when the program hit report.Prepare(true).

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