CODEWITHSUNDEEP
asp.netweb-serviceswebformsasmx
Michiel
Michiel

Reputation: 4260

asmx webservice doesn't read postdata

I have an .asmx webservice that works fine except it doesn't read prostdata. It looks like this:

namespace mynamespace.liby
{

    [ScriptService]
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]

    public class json : System.Web.Services.WebService
    {

        [WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public List<sp_tech_keywordSearch_Result> search()
        {

            const string KEY = "key";
            var key = string.Empty;

            // convert postdata to dictionary
            // this piece of code works fine in my asp.net MVC controller but not here :-(
            string data = new StreamReader(HttpContext.Current.Request.InputStream).ReadToEnd();
            Dictionary<string, string> postData = JsonConvert.DeserializeObject<Dictionary<string, string>>(data);

            if (postData.ContainsKey(KEY)) { key = postData[KEY]; }

            var db = new my_Entities();
            var result = db.sp_myStoredProcedure(key);

            return result.ToList();

        }
    }
}

If I comment out the line 

// if (postData.ContainsKey(KEY)) { key = postData[KEY]; }

the procedure is called without parameter and returns a list of values. But when I keep this line it throws an error saying postData is null. When i check it in debug mode I see that data is an empty string.

I call this service with angular like this:

callService: function () {
    var postData = new Object();
    postData.key =4;

    return $http({ method: 'POST', url: MY_SERVICE, data: postData })
        .then(function (obj) {
            _Result = obj.data.d;
            return true;
        }, function (err) {
            _Result = [];
            console.log('serviceError');
            return false;
        });
},

My guess is that my code for reading postdata is wrong somehow. I have the same code running in an ASP.NET MVC controller and it works fine there. Does anyone have an idea on how to fix this?

Upvotes: 4

Views: 1850

Answers (1)

Michiel
Michiel

Reputation: 4260

Adding this solved the problem

// goto beginning of the inputstream
HttpContext.Current.Request.InputStream.Position = 0;

// convert postdata to dictionary
string data = new StreamReader(HttpContext.Current.Request.InputStream).ReadToEnd();

For some reason the 'cursor' of the inputstream is on the last position and ReadToEnd() results in reading an empty string.

Upvotes: 4

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