netDxf软件包-System.IO.FileNotFoundException：'无法加载文件或程序集'System.Drawing.Common

Question

我正在尝试为NETDXF项目运行自述文件中列出的代码示例：https://github.com/haplokuon/netDxf，但是代码在行DxfDocument dxf = new DxfDocument();上引发以下异常：

System.IO.FileNotFoundException: 'Could not load file or assembly 'System.Drawing.Common, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.'

我遵循的步骤： 1.我安装了Visual Studio 2019，并创建了一个新项目，其“目标框架”值为“ .NET core 3.0”，“输出类型”为“控制台应用程序”。 2.通过右键单击我的项目并选择“ Manage NuGet Packages”，然后从那里安装netDxf，我已经安装了netDXF软件包。 3.我运行了代码，看到了异常，并从.netDxf库中收集了以下堆栈跟踪：

    netDxf.dll!netDxf.Tables.TextStyle.TextStyle(string name, string font, bool checkName)  Unknown
    netDxf.dll!netDxf.Tables.TextStyle.TextStyle(string name, string font)  Unknown
    netDxf.dll!netDxf.Tables.TextStyle.Default.get()    Unknown
    netDxf.dll!netDxf.DxfDocument.AddDefaultObjects()   Unknown
    netDxf.dll!netDxf.DxfDocument.DxfDocument(netDxf.Header.HeaderVariables drawingVariables, bool createDefaultObjects, System.Collections.Generic.IEnumerable<string> supportFolders) Unknown
    netDxf.dll!netDxf.DxfDocument.DxfDocument(netDxf.Header.HeaderVariables drawingVariables)   Unknown
    netDxf.dll!netDxf.DxfDocument.DxfDocument() Unknown
>   Mason.dll!Mason.Program.Main() Line 15  C#

这是我尝试运行的完整代码段（Program.cs）：

using netDxf;
using netDxf.Entities;
using netDxf.Header;

namespace Mason
{
    class Program
    {
        public static void Main()
        {
            // your dxf file name
            string file = "sample.dxf";

            // by default it will create an AutoCad2000 DXF version
            DxfDocument dxf = new DxfDocument();
            // an entity
            Line entity = new Line(new Vector2(5, 5), new Vector2(10, 5));
            // add your entities here
            dxf.AddEntity(entity);
            // save to file
            dxf.Save(file);

            // this check is optional but recommended before loading a DXF file
            bool isBinary;
            DxfVersion dxfVersion = DxfDocument.CheckDxfFileVersion(file, out isBinary);
            // netDxf is only compatible with AutoCad2000 and higher DXF version
            if (dxfVersion < DxfVersion.AutoCad2000) return;
            // load file
            DxfDocument loaded = DxfDocument.Load(file);
        }
    }
}