Ext.Direct .NET Router

[nayato]

It's always great to see some .net action happening around ExtJS!

Though I think using async handlers is a bit dated approach. Did you think of writing WCF service for that purpose? It could help a lot in writing server-side code in more focused, service oriented manner.
It also has JSON support is built in and provides extended possibilities for easy exception handling.

[evant]

Not really, I'm a bit out of the loop as far as .NET is concerned. Could you point me to some relevant examples? FYI the built in JSON support in .NET I found was reasonably poor, which is why I ended up using JSON.NET.

[Lloyd K]

WCF is far too heavy and overcomplicated which will put many off imho. Also I agree with Evan in that .NET's JSON support is poor and the Newtonsoft library is probably the best freely available.

[crp_spaeth]

I agree with evant for using JSON.NET.

This is much faster and better than the builtin json Support!

If you had a look at my Implementation of a Direct Router you may have seen that its really easy to let JSON.Net try to deserialize the json data to fit into the defined method parameters. This may shows a small part of the power of JSON.NET

[Revotion]

To Start with, I am more of a VB user, so please forgive the fact that this is not in C#. As a feature request, why not create a DirectHandler as an IHTTPHandler that can do all of the work for the user, while grouping related function into a single file (and not having to expose every method in an Application to all pages)

Examples as follows.....


The DirectHandler to be added to the DLL (notice that I wrapped the DirectHandler and ApiHandler into one file, and check for the existance of any data. If none found, we assume you are looking for the API Definition).

Imports Ext.Direct

Public Class DirectHandler
    Implements IHttpHandler

    Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

        Dim provider As DirectProvider = Nothing
        Dim cacheKey As String = GetType(Handler1).Name
        Dim cache = DirectProviderCache.GetInstance()

        If context.Request.TotalBytes = 0 AndAlso String.IsNullOrEmpty(context.Request("extAction")) Then

            context.Response.ContentType = "text/javascript"

            If cache.ContainsKey(cacheKey) Then
                provider = cache(cacheKey)
            Else
                provider = New DirectProvider("Ext.app." & cacheKey & "_API", context.Request.Path)
                provider.Configure(New Object() {Me})
                cache.Add(cacheKey, provider)
            End If

            context.Response.Write(provider.ToString())

        Else

            context.Response.ContentType = "text/javascript"

            provider = cache(cacheKey)

            context.Response.Write(DirectProcessor.Execute(provider, context.Request))

        End If

    End Sub

    ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property

End Class

The Handler file that I would add to my application (remember to add the file as a Genric Handler with the ashx extension) ....

Imports Ext.Direct

<DirectAction()> _
Public Class Handler1
    Inherits DirectHandler

    <DirectMethod()> _
    Public Function Echo(ByVal name As String) As String
        Return "Echo: " & name
    End Function

End Class

And Finally, the HTML code need to use this....

    <script type="text/javascript" src="Handler1.ashx"></script>
    
    <script type="text/javascript">

        Ext.onReady(function() {

            Ext.Direct.addProvider(Ext.app.Handler1_API);

            Handler1.Echo("abc", function(result, response) { alert(result) })

            })
                
            
    </script>

[evant]

Wicked suggestions, I've made these changes, as well as

1) Exception handling
2) Better date handling

I'll update the original post.

[GodKnow]

Hello,

The sample in "ext-direct-pack.zip" response:

{"type":"rpc","tid":2,"action":"Sample","method":"SaveForm","result":"{\"firstName\":\"4\",\"lastName\":\"4\",\"age\":4}"}

The value of "result" is string.

So I modify Directresponse.cs:

return  JsonConvert.SerializeObject (response);

replace :

                    if (response.Result.GetType().ToString() == "Newtonsoft.Json.Linq.JObject")
                    {
                        JObject o = new JObject(
                            new JProperty("type",response.Type),
                            new JProperty("tid",response.TransactionId),
                            new JProperty("action",response.Action),
                            new JProperty("method",response.Method),
                            new JProperty("result",(JObject)response.Result)
                        );
                        return o.ToString();
                    }
                    else
                    {
                        return JsonConvert.SerializeObject(response);
                    }

The Sample.cs:

        [DirectMethodForm]
        public string SaveForm(HttpRequest request)
        {
            int age = 0;
            int.TryParse(request["age"], out age);
            JObject o = new JObject(
                new JProperty("firstName", request["firstName"]),
                new JProperty("lastName", request["lastName"]),
                new JProperty("age", age));
            return o.ToString(Newtonsoft.Json.Formatting.None);
        }

replace:

        [DirectMethodForm]
        public Object SaveForm(HttpRequest request)
        {
            int age = 0;
            int.TryParse(request["age"], out age);
            JObject o = new JObject(
                new JProperty("firstName", request["firstName"]),
                new JProperty("lastName", request["lastName"]),
                new JProperty("age", age));
            return o;
        }

response:

{
  "type": "rpc",
  "tid": 2,
  "action": "Sample",
  "method": "SaveForm",
  "result": {
    "firstName": "4",
    "lastName": "4",
    "age": 4
  }
}

Please tell me if you have any good idea.

[evant]

I've added something similar, now you can return JArray or JObjects from your methods and have them serialized. Updated the first post.

[GodKnow]

Sorry, I have a question：
In the Router0.4，I need add a class，please tell me how to do that？

thx.

I am doing it like this now：
In the defalut.aspx,add:

<script type="text/javascript" src="test.ashx"></script>

test.ashx:

namespace ExtDirectSample
{
    [DirectAction]
    public class test : DirectHandler
    {

        public override string ProviderName
        {
            get
            {
                return "Ext.app.REMOTING_API_1";
            }
        }

        public override string Namespace
        {
            get
            {
                return "MyApp_1";
            }
        }

        [DirectMethod]
        public string SayHello()
        {
            return "Hello!";
        }

    }
}

return:

Ext.app.REMOTING_API_1 = {"type":"remoting","url":"/control/ExtDirectSample2/ExtDirectSample/test.ashx"
,"namespace":"MyApp_1","actions":{"test":[{"name":"SayHello","len":0}]}};

thx.

[evant]

What are you trying to do? Sorry I don't understand.