Saving image into SQL Server with web service in Xamarin Android

问题

I am developing an app with Xamarin Android, I want to select an image from the gallery and save it to a SQL Server database using a WCF service.

My code is working except one part that the image want to convert and save into the database.

My column datatype for the image is: varbinary(MAX).

My variable definition for the image in the project is: byte[] imageByte;

Some part of my code is below:

private void PicSelected()
{
        //mSelectedPic = selectedPic;
        Intent = new Intent();
        Intent.SetType("image/*");
        Intent.SetAction(Intent.ActionGetContent);
        StartActivityForResult(Intent.CreateChooser(Intent, "Select Picture"),0);
}

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
        base.OnActivityResult(requestCode, resultCode, data);

        if (resultCode == Result.Ok)
        {
            Stream stream = ContentResolver.OpenInputStream(data.Data);

            Bitmap bitmap = BitmapFactory.DecodeStream(stream);
            MemoryStream memStream = new MemoryStream();
            bitmap.Compress(Bitmap.CompressFormat.Webp, 100, memStream);
            byte[] picData = memStream.ToArray();
            picDataPublic = picData;
        }
}

This code selects a picture from the gallery and then convert it to byte array (byte[]), I think the problem is here.

Then the code shown below communicates with the database and passes the data to the WCF service.

_btnAdd.Click += async (sender, args) =>
        {
            string sUrl = "http://192.168.43.31/Service1.svc/insertIntoTableAdvertise";
            string sContentType = "application/json";
            CheckAppPermissions();

            JObject oJsonObject = new JObject();
            oJsonObject.Add("TxtGroup", _edtAdvGrouping.Text);
            oJsonObject.Add("TxtTitle", _edtTitle.Text);
            oJsonObject.Add("TxtDate", "1397/10/14");
            oJsonObject.Add("TxtLocation", "شاهین");
            oJsonObject.Add("TxtNumber", _edtNumber.Text);
            oJsonObject.Add("TxtPrice", _edtPrice.Text);
            oJsonObject.Add("TxtExpression", _edtExpression.Text);
            oJsonObject.Add("ImageByte", Convert.ToBase64String(picDataPublic));
            //oJsonObject.Add("ImageByte", "");

            try
            {
                var content = new StringContent(oJsonObject.ToString(), Encoding.UTF8, sContentType);

                var response = await httpClient.PostAsync(sUrl, content);

                var responseContent = await response.Content.ReadAsStringAsync();
                if (responseContent == "1")
                {
                    Toast.MakeText(this, "Success. " + responseContent, ToastLength.Short).Show();

                }
                else
                {
                    Toast.MakeText(this, "Failure." + responseContent, ToastLength.Short).Show();
                }
            }
            catch (Exception ex)
            {
                Toast.MakeText(this, ex.Message.ToString(), ToastLength.Short).Show();
            }
            finally
            {
                this.Finish();
            }
        };

When the code is:

oJsonObject.Add("ImageByte", "");

the service works and returns a success message, but when this condition:

oJsonObject.Add("ImageByte", Convert.ToBase64String(picDataPublic));

the service doesn't work.

I think the problem is with converting the image to the byte array.

Please help me with this problem

来源：https://stackoverflow.com/questions/54242363/saving-image-into-sql-server-with-web-service-in-xamarin-android

标签

wcf

xamarin.android