重新设计了FlowLIbrary相关类；为工作台默认添加了基础依赖、默认画布。

NodeFlow/Tool/FlowLibraryAssemblyContext.cs

@@ -0,0 +1,59 @@
+using System.Reflection;
+using System.Runtime.Loader;
+
+namespace Serein.NodeFlow.Tool
+{
+    /// <summary>
+    /// 流程依赖加载
+    /// </summary>
+    public class FlowLibraryAssemblyContext : AssemblyLoadContext
+    {
+        private readonly AssemblyDependencyResolver _resolver;
+
+        /// <summary>
+        ///  创建新的加载上下文
+        /// </summary>
+        /// <param name="baseLibraryPath">流程基础依赖类库路径</param>
+        /// <param name="name"></param>
+        public FlowLibraryAssemblyContext(string baseLibraryPath, string name) : base(name, isCollectible: true)
+        {
+            _resolver = new AssemblyDependencyResolver(baseLibraryPath);
+        }
+
+        /// <summary>
+        /// 加载指定的程序集
+        /// </summary>
+        /// <param name="assemblyName"></param>
+        /// <returns></returns>
+        protected override Assembly? Load(AssemblyName assemblyName)
+        {
+            string? assemblyPath = _resolver.ResolveAssemblyToPath(assemblyName); // 加载程序集
+            if (!string.IsNullOrEmpty(assemblyPath))
+            {
+                var assembly = Default.LoadFromAssemblyPath(assemblyPath); // 通过默认方式进行加载程序集及相关依赖
+                //var assembly = LoadFromAssemblyPath(assemblyPath);
+                return assembly;
+            }
+            else
+            {
+                return Default.Assemblies.FirstOrDefault(x => x.FullName == assemblyName.FullName);
+            }
+
+            // return null;
+
+            // 构建依赖项的路径
+            //string assemblyPath = Path.Combine(AppContext.BaseDirectory, assemblyName.Name + ".dll");
+            //if (File.Exists(assemblyPath))
+            //{
+            //    return LoadFromAssemblyPath(assemblyPath);
+            //}
+            //assemblyPath = Path.Combine(filePath, assemblyName.Name + ".dll");
+            //if (File.Exists(assemblyPath))
+            //{
+            //    return LoadFromAssemblyPath(assemblyPath);
+            //}
+
+            //return null; // 如果没有找到，返回 null
+        }
+    }
+}