在Fluent Nhibernate中有一种流畅的方法来进行标准查询吗？

Question

Currently I create my criteria as follows:

gameCriteria = Restrictions.Eq("Name", videoGameName);

I was wondering if fluent nhibernate adds any features that allow something of the following:

gameCriteria = Restrictions.Eq<VideoGame>(v => v.Name, videoGameName);

In short, I want to remove the magic string . (My actual queries tend to involve many magic strings which lead to errors due to typos and such.)

Answer 1

Just found the answer in the repository that another developer wrote.

gameCriteria = Restrictions.Eq(Projections.Property<VideoGame>(v => v.Name), videoGameName);

Now I feel silly for the time I spent searching for this.

Answer 2

There is a built in NHibernate class Restrictions.cs . It provides this method:

/// <summary>
/// Build an ICriterion for the given property
/// </summary>
/// <param name="expression">lambda expression identifying property</param>
/// <returns>returns LambdaRestrictionBuilder</returns>
public static LambdaRestrictionBuilder On<T>(Expression<Func<T, object>> expression)
{
    ExpressionProcessor.ProjectionInfo projection = 
      ExpressionProcessor.FindMemberProjection(expression.Body);
    return new LambdaRestrictionBuilder(projection);
}

And we can use it like this:

// exact match
Restrictions.On<VideoGame>(v => v.Name == videoGameName);

or

// LIKE expression as 'videoGameName%'
Restrictions.On<VideoGame>(v => v.Name).IsLike(videoGameName, MatchMode.Start);