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AppIcons83.5x83.5@2x~ipad.png does not exist File

While building mp app, I was getting following error:
AppIcons83.5x83.5@2x~ipad.png does not exist File

The easiest way to solve this problem is:

Delete existing AppIcon file
Create a new AppIcon file
Add the missing icons (the iPad and other icon options will now be provided)

Also make sure the dimensions are correct. If the AppIcon file says 83.5 points with 2x file size then the dimension should be 167x167 png format etc.
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String to Array in C#

String to Array in C# 

 public object[] StringToArray(string sInput, string sSeparator, Type type)
        {
            string[] sStringList = sInput.Split(sSeparator.ToCharArray(),
                                              StringSplitOptions.RemoveEmptyEntries);
            object[] list = new object[sStringList.Length];

            for (int i = 0; i < sStringList.Length; i++)
            {
                list[i] = Convert.ChangeType(sStringList[i], type);
            }

            return list;
        }

Your project is not referencing the "MonoAndroid,Version=v8.1" framework. Add a reference to "MonoAndroid,Version=v8.1" in the "frameworks" section of your project.json, and then re-run NuGet restore.

I had  the same problem.
Reason: file obj/project.assets.json target "MonoAndroid,Version=v7.1" when my project target android version 8.1
I resolved it by:
Right click Android project => Properties => Application => Compile
using Android version => Android 7.1Clean and Build project => build success, and restart IDE.Right click Android project => Properties => Application => Compile
using Android version => Android 8.1Clean and Build project => build success
File obj/project.assets.json updated to "MonoAndroid,Version=v8.1"

iOS App Icon Missing on Xamarin iOS

iOS App Icon Missing on Xamarin iOS
I opened my info.plist with notepad and edited the Asset path which was pointing to the Resources/... folder while my icons were directly in the root of the application. make sure the following path is correct.
<key>XSAppIconAssets</key><string>Assets.xcassets/AppIcons.appiconset</string>