Hämta arbetsobjekt med frågor programmatiskt

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Azure DevOps Services

Ett vanligt scenario i Azure DevOps Services är att hämta arbetsobjekt med hjälp av frågor. Den här artikeln beskriver hur du implementerar det scenariot programmatiskt med hjälp av våra REST-API:er eller .NET-klientbibliotek.

Förutsättningar

Du måste ha följande objekt:

Skapa ett C#-projekt i Visual Studio

Information om C#-programmering i Visual Studio finns i dokumentationen för Visual Studio C#-programmering.

C#-kodinnehåll

Följande uppgifter utförs i följande kodexempel:

  1. Autentisera
    1. Skapa autentiseringsuppgifter med din PAT
    2. Generera klienten
  2. Hämta arbetsobjekten
    1. Skapa den fråga som du vill använda
    2. Hämta resultatet för den frågan
    3. Hämta var och en av arbetsobjekten efter ID

C#-kodfragment

// nuget:Microsoft.TeamFoundationServer.Client
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

using Microsoft.TeamFoundation.WorkItemTracking.WebApi;
using Microsoft.TeamFoundation.WorkItemTracking.WebApi.Models;
using Microsoft.VisualStudio.Services.Common;

public class QueryExecutor
{
    private readonly Uri uri;
    private readonly string personalAccessToken;

    /// <summary>
    ///     Initializes a new instance of the <see cref="QueryExecutor" /> class.
    /// </summary>
    /// <param name="orgName">
    ///     An organization in Azure DevOps Services. If you don't have one, you can create one for free:
    ///     <see href="https://go.microsoft.com/fwlink/?LinkId=307137" />.
    /// </param>
    /// <param name="personalAccessToken">
    ///     A Personal Access Token, find out how to create one:
    ///     <see href="/azure/devops/organizations/accounts/use-personal-access-tokens-to-authenticate?view=azure-devops" />.
    /// </param>
    public QueryExecutor(string orgName, string personalAccessToken)
    {
        this.uri = new Uri("https://dev.azure.com/" + orgName);
        this.personalAccessToken = personalAccessToken;
    }

    /// <summary>
    ///     Execute a WIQL (Work Item Query Language) query to return a list of open bugs.
    /// </summary>
    /// <param name="project">The name of your project within your organization.</param>
    /// <returns>A list of <see cref="WorkItem"/> objects representing all the open bugs.</returns>
    public async Task<IList<WorkItem>> QueryOpenBugs(string project)
    {
        var credentials = new VssBasicCredential(string.Empty, this.personalAccessToken);

        // create a wiql object and build our query
        var wiql = new Wiql()
        {
            // NOTE: Even if other columns are specified, only the ID & URL are available in the WorkItemReference
            Query = "Select [Id] " +
                    "From WorkItems " +
                    "Where [Work Item Type] = 'Bug' " +
                    "And [System.TeamProject] = '" + project + "' " +
                    "And [System.State] <> 'Closed' " +
                    "Order By [State] Asc, [Changed Date] Desc",
        };

        // create instance of work item tracking http client
        using (var httpClient = new WorkItemTrackingHttpClient(this.uri, credentials))
        {
            // execute the query to get the list of work items in the results
            var result = await httpClient.QueryByWiqlAsync(wiql).ConfigureAwait(false);
            var ids = result.WorkItems.Select(item => item.Id).ToArray();

            // some error handling
            if (ids.Length == 0)
            {
                return Array.Empty<WorkItem>();
            }

            // build a list of the fields we want to see
            var fields = new[] { "System.Id", "System.Title", "System.State" };

            // get work items for the ids found in query
            return await httpClient.GetWorkItemsAsync(ids, fields, result.AsOf).ConfigureAwait(false);
        }
    }

    /// <summary>
    ///     Execute a WIQL (Work Item Query Language) query to print a list of open bugs.
    /// </summary>
    /// <param name="project">The name of your project within your organization.</param>
    /// <returns>An async task.</returns>
    public async Task PrintOpenBugsAsync(string project)
    {
        var workItems = await this.QueryOpenBugs(project).ConfigureAwait(false);

        Console.WriteLine("Query Results: {0} items found", workItems.Count);

        // loop though work items and write to console
        foreach (var workItem in workItems)
        {
            Console.WriteLine(
                "{0}\t{1}\t{2}",
                workItem.Id,
                workItem.Fields["System.Title"],
                workItem.Fields["System.State"]);
        }
    }
}