As you probably know, the DevExpress
WPF Data Grid can be bound to a
gRPC service. gRPC is a modern, high-performance remote procedure call (RPC) framework that can run on any platform. Our
Virtual Sources allow you to connect to a gRPC service easily.
To connect to a gRPC service, you must first create a client object to access service methods:
- Specify the channel that connects to a gRPC service.
- Pass this channel as an argument to a new instance of the IssuesService.IssuesServiceClient class:
Channel channel;
IssuesService.IssuesServiceClient client;
public IssueServiceViewModel() {
channel = new Channel("127.0.0.1:30051", ChannelCredentials.Insecure);
client = new IssuesService.IssuesServiceClient(channel);
// ...
}
[Command]
public void Closed() {
channel.ShutdownAsync().Wait();
}
When you build the application, it will automatically generate IssuesServiceBase and IssuesServiceClient classes based on the .proto file. You can view the complete .proto file with request and response methods in \IssuesData\issuesdata.proto.
To proceed, create a command that calls the service's FetchIssuesAsync method. In this command, specify a request protocol buffer object (Fetch in this example). Pass this object to the client's FetchIssuesAsync method. When the remote procedure call (RPC) is complete, the service returns a response protocol buffer object (Issues in this example).
[Command]
public void FetchIssues(FetchRowsAsyncArgs args) {
args.Result = GetIssuesAsync(args);
}
async Task<FetchRowsResult> GetIssuesAsync(FetchRowsAsyncArgs args) {
var take = args.Take ?? 30;
var issues = await client.FetchIssuesAsync(new Fetch {
Skip = args.Skip,
Take = take,
Sort = GetIssueSortOrder(args.SortOrder),
Filter = (IssueFilter)args.Filter
});
var issuesArray = issues.Items.ToArray();
return new FetchRowsResult(issuesArray, hasMoreRows: issuesArray.Length == take);
}
<dxg:GridControl.ItemsSource>
<dx:InfiniteAsyncSource ElementType="{x:Type issuesdata:Issue}"
FetchRowsCommand="{Binding FetchIssuesCommand}"/>
</dxg:GridControl.ItemsSource>
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