Add quick predicate expression build method.

Source/Euonia.Core/Reflection/Reflect.cs

@@ -397,18 +397,33 @@ public static void SetValue(object obj, Type objectType, string propertyPath, ob
 		if (properties.Length == 1)
 		{
 			property = objectType.GetProperty(properties.First());
+			if (property == null)
+			{
+				throw new MissingMemberException($"Property {properties.First()} not found on type {objectType.FullName}.");
+			}
+
 			property.SetValue(obj, value);
 			return;
 		}
 
 		for (var i = 0; i < properties.Length - 1; i++)
 		{
 			property = currentType.GetProperty(properties[i]);
+			if (property == null)
+			{
+				throw new MissingMemberException($"Property {properties[i]} not found on type {currentType.FullName}.");
+			}
+
 			obj = property.GetValue(obj, null);
 			currentType = property.PropertyType;
 		}
 
 		property = currentType.GetProperty(properties.Last());
+		if (property == null)
+		{
+			throw new MissingMemberException($"Property {properties.Last()} not found on type {currentType.FullName}.");
+		}
+
 		property.SetValue(obj, value);
 	}
 
@@ -467,6 +482,108 @@ public static object InvokeGenericMethod(object obj, string methodName, Type[] g
 		var genericMethod = method.MakeGenericMethod(genericTypes);
 		return genericMethod.Invoke(method.IsStatic ? null : obj, parameters);
 	}
+
+	#region Public Static Methods
+
+	/// <summary>
+	/// Attempts to find the overloaded method that we want to call. Returns null if not found. This overload looks at the parameter types passed in vs method parameters off of the type we pass in
+	/// </summary>
+	/// <param name="methodNameToRetrieve">What is the method to name to find</param>
+	/// <param name="typeToLookThroughTheMethods">The type to retrieve the methods off of, so we can look through it and try to find the correct method</param>
+	/// <param name="methodParameterTypes">Look for the method parameter types in the method to match. If the method takes a string and an int, then we will look for that in every method</param>
+	/// <returns>Method info found, or null value if not found</returns>
+	public static MethodInfo FindMethod(string methodNameToRetrieve, Type typeToLookThroughTheMethods, params Type[] methodParameterTypes)
+	{
+		//going to use the overload. So we can create the func with calling the other method
+		return FindMethod(methodNameToRetrieve, typeToLookThroughTheMethods, x => MethodParameterSelector(x, methodParameterTypes));
+	}
+
+	/// <summary>
+	/// Attempts to find the overloaded method that we want to call. Returns null if not found. This method will try to evaluate the MethodSelect for each method and check to see if it returns true.
+	/// </summary>
+	/// <param name="methodNameToRetrieve">What is the method to name to find</param>
+	/// <param name="methodSelector">Gives the calling method the ability to look through the parameters and pick the correct method</param>
+	/// <param name="typeToLookThroughTheMethods">The type to retrieve the methods off of, so we can look through it and try to find the correct method</param>
+	/// <returns>Method info found, or null value if not found</returns>
+	public static MethodInfo FindMethod(string methodNameToRetrieve, Type typeToLookThroughTheMethods, Func<MethodInfo, bool> methodSelector)
+	{
+		//use the overload
+		return FindMethod(methodNameToRetrieve, typeToLookThroughTheMethods.GetMethods(), methodSelector);
+	}
+
+	/// <summary>
+	/// Attempts to find the overloaded method that we want to call. Returns null if not found. This method will try to evaluate the MethodSelect for each method and check to see if it returns true.
+	/// Call this method if you already have the method info's that match the same name you are looking for
+	/// </summary>
+	/// <param name="methodNameToRetrieve">What is the method to name to find</param>
+	/// <param name="methodSelector">Gives the calling method the ability to look through the parameters and pick the correct method</param>
+	/// <param name="methodsToLookThrough">Methods that have the same name. Or methods to loop through and inspect against the method selector.</param>
+	/// <returns>Method info found, or null value if not found</returns>
+	public static MethodInfo FindMethod(string methodNameToRetrieve, IEnumerable<MethodInfo> methodsToLookThrough, Func<MethodInfo, bool> methodSelector)
+	{
+		//let's start looping through the methods to see if we can find a match
+		return methodsToLookThrough.FirstOrDefault(methodToInspect => string.Equals(methodNameToRetrieve, methodToInspect.Name, StringComparison.OrdinalIgnoreCase) && methodSelector(methodToInspect));
+
+		//we never found a match, so just return null
+	}
+
+	#endregion
+
+	#region Private Static Methods
+
+	/// <summary>
+	/// Private helper method to look at the current method and inspect it for the method parameter types. If they match return true, else return false
+	/// </summary>
+	/// <param name="methodToEvaluate">Method to evaluate and check if we have a match based on the method parameter types</param>
+	/// <param name="methodParameterTypes"></param>
+	/// <returns>Do we have a match? Do the method parameter types match?</returns>
+	private static bool MethodParameterSelector(MethodBase methodToEvaluate, params Type[] methodParameterTypes)
+	{
+		//we are going to match the GetParameters and the MethodParameterTypes. It needs to match index for index and type for type. So GetParameters[0].Type must match MethodParameterTypes[0].Type...[1].Type must match [1].Type
+
+		//holds the index with the method parameter types we are up too
+		int i = 0;
+
+		//let's loop through the parameters
+		foreach (ParameterInfo thisParameter in methodToEvaluate.GetParameters())
+		{
+			//it's a generic parameter...ie...TSource then we are going to ignore it because whatever we pass in would be TSource
+			if (!thisParameter.ParameterType.IsGenericParameter)
+			{
+				//is this a generic type? we need to compare this differently
+				if (thisParameter.ParameterType.IsGenericType)
+				{
+					//is the method parameter a generic type?
+					if (!methodParameterTypes[i].IsGenericType)
+					{
+						//it isn't so return false..cause they aren't the same
+						return false;
+					}
+
+					//if the generic type's don't match then return false...This might be problematic...it works for the scenario which I'm using it for so we will leave this and modify afterwards
+					if (thisParameter.ParameterType.GetGenericTypeDefinition() != methodParameterTypes[i].GetGenericTypeDefinition())
+					{
+						//doesn't match return false
+						return false;
+					}
+				}
+				else if (thisParameter.ParameterType != methodParameterTypes[i].UnderlyingSystemType)
+				{
+					//this is a regular parameter so we can compare it normally
+					//we don't have a match...so return false
+					return false;
+				}
+			}
+
+			//increment the index
+			i++;
+		}
+
+		//if we get here then everything matches so return true
+		return true;
+	}
+
+	#endregion
 }
 
 /// <summary>