C＃反射-GetMethod

Question

I'm working on a project where System.Web.Helpers.Webgrid is being used as a base class for a new grid. I believe that it uses reflection to invoke private methods of the base class.

Could someone please clarify....... In the code below, seeing as GetDefaultColumnsMethod returns something, can I presume that System.Web.Helpers.WebGrid has a method on it named "GetDefaultColumns" ?

private MethodInfo GetDefaultColumnsMethod 
{
    get { return typeof(System.Web.Helpers.WebGrid).GetMethod("GetDefaultColumns", BindingFlags.Instance | BindingFlags.NonPublic); }
}

private IEnumerable<WebGridColumn> GetDefaultColumns(IEnumerable<string> exclusions)
{
    return (IEnumerable <WebGridColumn>)GetDefaultColumnsMethod.Invoke((System.Web.Helpers.WebGrid)this, BindingFlags.Instance | BindingFlags.NonPublic, null, new object[] { exclusions }, null);
}

Answer 1

In the code below, seeing as GetDefaultColumnsMethod returns something, can I presume that System.Web.Helpers.WebGrid has a method on it named "GetDefaultColumns"?

Yes.

• Type.GetMethod searches for the method specified by its name
• BindingFlags.Instance | BindingFlags.NonPublic BindingFlags.Instance | BindingFlags.NonPublic means you search an instance method (as opposed to a static one) that is not public (do note it might me protected / internal though).

Answer 2

Digging deeper - i added the debug code below and I now have a list of the methods....

So I can now debug and see what is there.....and more to the point, what is not in newer versions of the WebGrid component.

    Type tt = this.GetType();
    Type t = tt.BaseType;

    PropertyInfo[] props =
        t.GetProperties(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
    MethodInfo[] mths = t.GetMethods(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);