1 files changed, 99 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/Reflection/PrivateMethod.cs b/src/SMAPI/Framework/Reflection/PrivateMethod.cs
new file mode 100644
index 00000000..ba2374f4
--- /dev/null
+++ b/src/SMAPI/Framework/Reflection/PrivateMethod.cs
@@ -0,0 +1,99 @@
+using System;
+using System.Reflection;
+
+namespace StardewModdingAPI.Framework.Reflection
+{
+    /// <summary>A private method obtained through reflection.</summary>
+    internal class PrivateMethod : IPrivateMethod
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The type that has the method.</summary>
+        private readonly Type ParentType;
+
+        /// <summary>The object that has the instance method (if applicable).</summary>
+        private readonly object Parent;
+
+        /// <summary>The display name shown in error messages.</summary>
+        private string DisplayName => $"{this.ParentType.FullName}::{this.MethodInfo.Name}";
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The reflection metadata.</summary>
+        public MethodInfo MethodInfo { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="parentType">The type that has the method.</param>
+        /// <param name="obj">The object that has the instance method(if applicable).</param>
+        /// <param name="method">The reflection metadata.</param>
+        /// <param name="isStatic">Whether the field is static.</param>
+        /// <exception cref="ArgumentNullException">The <paramref name="parentType"/> or <paramref name="method"/> is null.</exception>
+        /// <exception cref="ArgumentException">The <paramref name="obj"/> is null for a non-static method, or not null for a static method.</exception>
+        public PrivateMethod(Type parentType, object obj, MethodInfo method, bool isStatic)
+        {
+            // validate
+            if (parentType == null)
+                throw new ArgumentNullException(nameof(parentType));
+            if (method == null)
+                throw new ArgumentNullException(nameof(method));
+            if (isStatic && obj != null)
+                throw new ArgumentException("A static method cannot have an object instance.");
+            if (!isStatic && obj == null)
+                throw new ArgumentException("A non-static method must have an object instance.");
+
+            // save
+            this.ParentType = parentType;
+            this.Parent = obj;
+            this.MethodInfo = method;
+        }
+
+        /// <summary>Invoke the method.</summary>
+        /// <typeparam name="TValue">The return type.</typeparam>
+        /// <param name="arguments">The method arguments to pass in.</param>
+        public TValue Invoke<TValue>(params object[] arguments)
+        {
+            // invoke method
+            object result;
+            try
+            {
+                result = this.MethodInfo.Invoke(this.Parent, arguments);
+            }
+            catch (Exception ex)
+            {
+                throw new Exception($"Couldn't invoke the private {this.DisplayName} field", ex);
+            }
+
+            // cast return value
+            try
+            {
+                return (TValue)result;
+            }
+            catch (InvalidCastException)
+            {
+                throw new InvalidCastException($"Can't convert the return value of the private {this.DisplayName} method from {this.MethodInfo.ReturnType.FullName} to {typeof(TValue).FullName}.");
+            }
+        }
+
+        /// <summary>Invoke the method.</summary>
+        /// <param name="arguments">The method arguments to pass in.</param>
+        public void Invoke(params object[] arguments)
+        {
+            // invoke method
+            try
+            {
+                this.MethodInfo.Invoke(this.Parent, arguments);
+            }
+            catch (Exception ex)
+            {
+                throw new Exception($"Couldn't invoke the private {this.DisplayName} field", ex);
+            }
+        }
+    }
+}
+\ No newline at end of file