我的目标是从用户那里获取图像并调整其大小，然后将其上传到 azure 移动应用程序简易表，但我遇到了异常

Question

我正在研究 visual stdio xamarin.android 我的要求是从图库中获取图像并在图像视图中显示，然后将其上传到 azure mobile easy table 我的代码在下面请帮助在哪里我的错误

我的客户数据 class 是：

class ClientData
  {
    public string Id { get; set; }
    [JsonProperty(PropertyName = "UserName")]
    public string userName { set; get; }
    [JsonProperty(PropertyName = "Passward")]
    public string passward { set; get; }
    [JsonProperty(PropertyName = "Phone")]
    public string phone { set; get; }
    [JsonProperty(PropertyName = "City")]
    public string city { set; get; }
    [JsonProperty(PropertyName = "Work")]
    public string work { set; get; }
    [JsonProperty(PropertyName = "ProfilePic")]
    public string profile { set; get; }
   }

我的 Activity 代码是：

using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using System.Collections.Generic;
using System.IO;
using Android.Graphics;
using Microsoft.WindowsAzure.MobileServices;
using System.Threading.Tasks;
using Microsoft.WindowsAzure.MobileServices.Sync;
using Microsoft.WindowsAzure.MobileServices.SQLiteStore;
using Android.Util;

namespace CarryARideAnyWere
 {
    [Activity(Label = "SignUpActivity", Theme = "@style/MyAppTheme")]
public class SignUpActivity : Activity
{
    AutoCompleteTextView Cities;
    EditText userName;
    EditText passward;
    EditText retypePassward;
    EditText phone;
    EditText work;
    Button register;
    ImageView profilePic;
    Bitmap bit;
    byte[] b;
    private MobileServiceClient client;
    private IMobileServiceSyncTable<ClientData> clientData;
    const string LocalDBFileName = "ClientDataFile";
    const string ApplicationURL =        "http://carryarideanywhere.azurewebsites.net/";
    protected override async void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        // Create your application here
        SetContentView(Resource.Layout.SignUp);
        //perform plateform related initialization
        CurrentPlatform.Init();
        //to get City of user
        Cities = FindViewById<AutoCompleteTextView>(Resource.Id.City);
        //geting Layout widgets
        userName = FindViewById<EditText>(Resource.Id.userName);
        passward = FindViewById<EditText>(Resource.Id.passward);
        retypePassward = FindViewById<EditText>(Resource.Id.reenterpass);
        phone = FindViewById<EditText>(Resource.Id.PhoneNumber);
        work = FindViewById<EditText>(Resource.Id.work);
        profilePic = FindViewById<ImageView>(Resource.Id.profilepic);
        register = FindViewById<Button>(Resource.Id.Register);
        //Geting Array of Cities
        String[] citiesofPak =     Resources.GetStringArray(Resource.Array.cities);
        Cities.Adapter = new ArrayAdapter<string>(this,         Resource.Layout.CitiesView, citiesofPak);

        //Creating client object 
        client = new MobileServiceClient(ApplicationURL);
        //Initializing LocalStore 
        await InitLocalStoreAsync();
        clientData = client.GetSyncTable<ClientData>();
        //Defining Click Event of Register button

        register.Click += OnRegisterClick;
        //registering click event of image view
        profilePic.Click -= OnProfilePicClick;
        profilePic.Click += OnProfilePicClick;
       b = new byte[] { 12, 12, 12, 12 };



    }
    private void OnRegisterClick(object sender, EventArgs e)
    {

        if (userName.Text == string.Empty | passward.Text == string.Empty |          retypePassward.Text == string.Empty | phone.Text == string.Empty |     Cities.Text == string.Empty | work.Text == string.Empty)
        {
            CreateDialog.CreateAndShowDialog("Please fill all the Boxes",   "Error", this);
            return;
        }
        if (passward.Text != retypePassward.Text)
        {
            CreateDialog.CreateAndShowDialog("passward Does not match", "Error", this);
            return;
        }
        AddData();

        Intent intent = new Intent(this, typeof(LogInActivity));
        intent.PutExtra(Constants.Start, true);
      //  StartActivity(intent);
     //   this.Finish();


    }
    private async Task InitLocalStoreAsync()
    {
        var store = new MobileServiceSQLiteStore(LocalDBFileName);
        store.DefineTable<ClientData>();
        await client.SyncContext.InitializeAsync(store);
    }
    private async Task PushData()
    {
        try
        {


            await client.SyncContext.PushAsync();
            IMobileServiceTableQuery<ClientData> query = clientData
                                                     .Where(u => u.phone == phone.Text);
            await clientData.PullAsync(null, query);
        }
        catch (Java.Net.MalformedURLException)
        {
            CreateDialog.CreateAndShowDialog(new Exception("There was error creating MobileService verify URL"), "Error", this);
        }
        catch (Exception e)
        {
            CreateDialog.CreateAndShowDialog(e, "Error", this);
        }
    }
    public async void AddData()
    {
        if (client == null)
        {
            return;
        }
        var Data = new ClientData { userName = userName.Text, passward =     passward.Text, phone = phone.Text, city = Cities.Text, work =     work.Text,profile=convert(bit)};
        try
        {
            CreateDialog.CreateAndShowDialog(convert(bit).Length.ToString(), "bytearrylength", this);

            await clientData.InsertAsync(Data);
            await PushData();
        }
        catch (Exception e)
        {
            CreateDialog.CreateAndShowDialog(e, "Error in datauploading", this);
        }

    }
    private void OnProfilePicClick(object sender, EventArgs e)
    {
        Intent intent = new Intent();
        intent.SetType("image/*");
        intent.SetAction(Intent.ActionGetContent);
       StartActivityForResult(Intent.CreateChooser(intent, "Select a pic"), 0);
    }
    protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
    {
        base.OnActivityResult(requestCode, resultCode, data);
        if (resultCode == Result.Ok)
        {
               bit = calculateRequiredimentions(data.Data, 150, 150);
            Stream stream = ContentResolver.OpenInputStream(data.Data);
            bit = BitmapFactory.DecodeStream(stream);
            profilePic.SetImageBitmap(bit);

        }
    }
    private string convert(Bitmap bitmap)
    {
        byte[] bitmapData;
        string ImageEncoding;
        using (var stream = new MemoryStream())
        {
            bitmap.Compress(Bitmap.CompressFormat.Png, 0, stream);



            bitmapData = stream.ToArray();
            ImageEncoding=Base64.EncodeToString(bitmapData,Base64Flags.Default);
            CreateDialog.CreateAndShowDialog(bitmapData.Length.ToString(), "bytearrylength", this);
        }
        return ImageEncoding;
    }
    private Bitmap calculateRequiredimentions(Android.Net.Uri data,int requestedHeight,int requestedWidth)
    {
        Stream stream = ContentResolver.OpenInputStream(data);
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.InJustDecodeBounds = true;
        BitmapFactory.DecodeStream(stream);
        options.InSampleSize = calcualteintvalue(options, requestedHeight, requestedWidth);
        stream = ContentResolver.OpenInputStream(data);
        options.InJustDecodeBounds = false;
        Bitmap map = BitmapFactory.DecodeStream(stream,null,options);
        return map;
    }
    private int calcualteintvalue(BitmapFactory.Options options,int requestedHeight,int requestedWidth)
    {
        int height = options.OutHeight;
        int width = options.OutWidth;
        int returendValue = 1;
        if (height > requestedHeight || width > requestedWidth)
        {
            int halfheight = height / 2;
            int halfwidth = width / 2;


            while ((halfheight / returendValue) > requestedHeight && (halfwidth / returendValue) > requestedWidth)
            {
                returendValue *= 2;
            }
        }
        return returendValue;
    }

}
}

Answer 1

一些明显的问题：

您的连接是 http - 它需要是 https。
您在 PullAsync() 中指定了一个查询，但没有查询名称，因此没有增量同步
您没有包括用于增量同步和冲突解决的 updatedAt、createdAt 和版本
您正在将二进制数据存储在字符串中 - 您不能那样做
您假设您的数据小于 255 字节（简单 tables 中字符串的最大大小）

可能还有其他的，但是你没有发布任何异常数据，也没有查看后台日志，所以无从知晓。

看看 http://aka.ms/zumobook 上的书，尤其是第 3 章和第 4 章。第 3 章介绍 table 数据同步，第 4 章介绍自定义 API 和文件操作。

我的目标是从用户那里获取图像并调整其大小，然后将其上传到 azure 移动应用程序简易表，但我遇到了异常

My Goal is to take Image from user and resize it and then upload it to azure mobile app easy tables but I am geting exception

c#

xamarin.android

azure-mobile-services