[Android] Fix for WebView Fails to Load URLs with Certain Encoded Characters

[praveenkumarkarunanithi]

Root Cause

The root cause of the issue is the use of Uri.IsWellFormedUriString for validating URLs in the WebView control. This method applies overly strict checks, including the IsWellFormedOriginalString test, which can incorrectly reject valid URLs, especially those containing encoded characters or international characters. This leads to improper handling of certain valid URLs, causing them to be treated as relative paths instead of absolute URLs.

Description of Change

In the WebView control, the URL validation logic in MauiWebView.LoadUrl has been updated to replace Uri.IsWellFormedUriString with Uri.TryCreate. This change ensures that a wider range of valid URLs, including those with encoded and international characters, are correctly handled as absolute URLs.

Issues Fixed

Fixes #26843
Fixes #23767
Fixes #23690
Closes #24002

Tested the behaviour in the following platforms

• Android
• Windows
• iOS
• Mac

Screenshots

Before Issue Fix	After Issue Fix

[praveenkumarkarunanithi]

@dotnet-policy-service agree company="Syncfusion, Inc."

[jsuarezruiz]

/azp run

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[jfversluis]

Build error

/Users/builder/azdo/_work/3/s/src/Core/src/Platform/WebViewHelper.cs(9,32): error CS1503: Argument 1: cannot convert from 'char' to 'string' [/Users/builder/azdo/_work/3/s/src/Core/src/Core.csproj::TargetFramework=netstandard2.0]

[MartyIX]

Build error

/Users/builder/azdo/_work/3/s/src/Core/src/Platform/WebViewHelper.cs(9,32): error CS1503: Argument 1: cannot convert from 'char' to 'string' [/Users/builder/azdo/_work/3/s/src/Core/src/Core.csproj::TargetFramework=netstandard2.0]

IMHO we hit #27003 (comment)