南希模型与儿童班约束

Question

我们遇到了Nancy的默认模型活页夹。给出以下...

public class Foo
{
    public Foo()
    {
    }

    public string Name { get; set; }

    public Bar Bar { get; set; }
}

public class Bar
{
    public string Name { get; set; }
}

.

具有像... 的元素

<input type="text" value="Name" />
<input type="text" value="Bar.Name" />

.

使用默认的模型粘合剂如此。

var foo = this.Bind<Foo>();

这正确绑定foo.name但未能绑定foo.bar.name

是否有一种方法可以使这种绑定与默认的粘合剂或我们需要自己滚动？如果是这样的话有什么好的例子？

Answer 1

为什么不尝试这个。我相当肯定可以优化递归，并且会在它不起作用的地方提出，并且它可以放在巧妙的地方，而不是imodelbinder，但它基本上是你想要的。

/// <summary>
/// Sample model binder that manually binds customer models
/// </summary>
public class CustomModelBinder : IModelBinder
{
    /// <summary>
    /// Bind to the given model type
    /// </summary>
    /// <param name="context">Current context</param>
    /// <param name="modelType">Model type to bind to</param>
    /// <param name="blackList">Blacklisted property names</param>
    /// <returns>Bound model</returns>
    public object Bind(NancyContext context, Type modelType, params string[] blackList)
    {
        var parentObject = Activator.CreateInstance(modelType);

        foreach (var key in context.Request.Form)
        {
            var value = context.Request.Form[key];
            this.SetObjectValue(parentObject, modelType, key, value);
        }

        return parentObject;
    }

    /// <summary>
    /// Sets the object value.
    /// </summary>
    /// <param name="instance">The instance.</param>
    /// <param name="type">The type.</param>
    /// <param name="key">Name of the property.</param>
    /// <param name="propertyValue">The property value.</param>
    private void SetObjectValue(object instance, Type type, string key, string propertyValue)
    {
        if (key.Contains("."))
        {
            this.SetObjectValueDeep(instance, type, key, propertyValue);
        }

        PropertyInfo propertyInfo = type.GetProperty(key);
        if (propertyInfo == null)
        {
            return;
        }

        propertyInfo.SetValue(instance, Convert.ChangeType(propertyValue, propertyInfo.PropertyType), null);
    }

    /// <summary>
    /// Sets the object value derp.
    /// </summary>
    /// <param name="instance">The instance.</param>
    /// <param name="type">The type.</param>
    /// <param name="key">The key.</param>
    /// <param name="propertyValue">The property value.</param>
    private void SetObjectValueDeep(object instance, Type type, string key, string propertyValue)
    {
        var propList = key.Split('.').ToList();

        PropertyInfo propertyInfo = type.GetProperty(propList.First());
        if (propertyInfo == null)
        {
            return;
        }

        var childObject = propertyInfo.GetValue(instance, null);

        if (childObject == null)
        {
            childObject = Activator.CreateInstance(propertyInfo.PropertyType);
            propertyInfo.SetValue(instance, childObject, null);
        }

        propList.RemoveAt(0);

        var newKey = propList.Aggregate(string.Empty, (current, prop) => current + (prop + ".")).TrimEnd('.');

        if (newKey.Contains("."))
        {
            this.SetObjectValueDeep(childObject, childObject.GetType(), newKey, propertyValue);
        }
        else
        {
            this.SetObjectValue(childObject, childObject.GetType(), newKey, propertyValue);
        }
    }

    /// <summary>
    /// Determines whether this instance can bind the specified model type.
    /// </summary>
    /// <param name="modelType">Type of the model.</param>
    /// <returns>
    ///   <c>true</c> if this instance can bind the specified model type; otherwise, <c>false</c>.
    /// </returns>
    public bool CanBind(Type modelType)
    {
        return true;
    }
}

.