XNA创建自定义ModelProcessor

Question

我试图关注this教程，但在尝试实施时遇到错误。

对于行using Microsoft.Xna.Framework.Content.Pipeline; using Microsoft.Xna.Framework.Content.Pipeline.Graphics; using Microsoft.Xna.Framework.Content.Pipeline.Processors; 它告诉我：Error 3 The type or namespace name 'Pipeline' does not exist in the namespace 'Microsoft.Xna.Framework.Content' (are you missing an assembly reference?)

我尝试使用的每个课程都会突出显示并告诉我类似的内容：Error 8 The type or namespace name 'ModelProcessor' could not be found (are you missing a using directive or an assembly reference?)

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Content.Pipeline;
using Microsoft.Xna.Framework.Content.Pipeline.Graphics;
using Microsoft.Xna.Framework.Content.Pipeline.Processors;

// TODO: replace these with the processor input and output types.
using TInput = System.String;
using TOutput = System.String;
using System.IO;

namespace Game.Engine
{
    /// <summary>
    /// This class will be instantiated by the XNA Framework Content Pipeline
    /// to apply custom processing to content data, converting an object of
    /// type TInput to TOutput. The input and output types may be the same if
    /// the processor wishes to alter data without changing its type.
    ///
    /// This should be part of a Content Pipeline Extension Library project.
    ///
    /// TODO: change the ContentProcessor attribute to specify the correct
    /// display name for this processor.
    /// </summary>
    [ContentProcessor]
    public class CustomEffectModelProcessor : ModelProcessor
    {
        protected override MaterialContent ConvertMaterial(MaterialContent material, ContentProcessorContext context)
        {
            EffectMaterialContent myMaterial = new EffectMaterialContent();

            string effectPath = Path.GetFullPath("MyEffect.fx");

            myMaterial.Effect = new ExternalReference<EffectContent>(effectPath);

            return base.ConvertMaterial(myMaterial, context);
        }
    }
}