To handle this error in a Blazor WebAssembly application, you can use the JavaScript Interop feature to check the network status before making the API call. You can use the navigator.onLine property to check if the browser is online or offline. If it is offline, you can show a custom message to the user and prevent the API call from being made.
Here is an example of how you can use JavaScript Interop to check the network status and handle the error:
In your Razor component, add a reference to the JavaScript function that will check the network status:
<script src="path/to/check-network-status.js"></script>
In the JavaScript file, define the function that will check the network status:
window.checkNetworkStatus = async () => {
if (!navigator.onLine) {
alert("You are offline. Please check your internet connection.");
return false;
}
return true;
}
In your Razor component, call the JavaScript function before making the API call:
@code { private async Task GetData() {
bool isOnline = await JSRuntime.Current.InvokeAsync<bool>("checkNetworkStatus");
if (isOnline) {
}
}
}
This way, you check the network status before making the API call, and if the user is offline, you can show a custom message and prevent the API call from being made.
Note: This is a basic example, you can customize it to your needs.