oqtane.framework/Oqtane.Client/Modules/Controls/ModuleMessage.razor

@namespace Oqtane.Modules.Controls
@inherits ModuleBase

@if (!string.IsNullOrEmpty(_message))
{
    <div class="@_classname" role="alert">@_message</div>
    <br />
}

@code {
    private string _message = string.Empty;
    private string _classname = "alert alert-danger";

    [Parameter]
    public string Message { get; set; }

    [Parameter]
    public MessageType Type { get; set; }

    protected override void OnParametersSet()
    {
        if (!string.IsNullOrEmpty(Message))
        {
            _message = Message;
            _classname = GetMessageType(Type);
        }
    }

    public void SetModuleMessage(string message, MessageType type)
    {
        _message = message;
        _classname = GetMessageType(type);
        StateHasChanged();
    }

    private string GetMessageType(MessageType type)
    {
        var classname = string.Empty;
        switch (type)
        {
            case MessageType.Success:
                classname = "alert alert-success";
                break;
            case MessageType.Info:
                classname = "alert alert-info";
                break;
            case MessageType.Warning:
                classname = "alert alert-warning";
                break;
            case MessageType.Error:
                classname = "alert alert-danger";
                break;
        }
        
        return classname;
    }
}