要按ID查找TFS构建请求，可以使用TFS的REST API来实现。以下是一个示例代码，演示如何使用C#编程语言通过TFS REST API按ID查找构建请求：

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

class Program
{
    static void Main()
    {
        // TFS服务器URL
        string tfsUrl = "https://your-tfs-server-url";

        // 构建请求ID
        int buildRequestId = 12345;

        // TFS REST API路径
        string apiPath = $"/DefaultCollection/_apis/build/builds?api-version=5.1&$filter=buildRequestId eq {buildRequestId}";

        // 发送HTTP GET请求
        Task.Run(async () =>
        {
            using (HttpClient client = new HttpClient())
            {
                client.BaseAddress = new Uri(tfsUrl);
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                // 发送GET请求
                HttpResponseMessage response = await client.GetAsync(apiPath);
                if (response.IsSuccessStatusCode)
                {
                    // 读取响应内容
                    var buildRequests = await response.Content.ReadAsAsync();

                    // 处理构建请求结果
                    foreach (var buildRequest in buildRequests.value)
                    {
                        Console.WriteLine($"Build Request ID: {buildRequest.id}, Definition ID: {buildRequest.definition.id}, Definition Name: {buildRequest.definition.name}");
                    }
                }
                else
                {
                    Console.WriteLine($"Failed to retrieve build requests. Status code: {response.StatusCode}");
                }
            }
        }).Wait();
    }
}

// 构建请求响应模型
class BuildRequestResponse
{
    public BuildRequest[] value { get; set; }
}

// 构建请求模型
class BuildRequest
{
    public int id { get; set; }
    public BuildDefinition definition { get; set; }
}

// 构建定义模型
class BuildDefinition
{
    public int id { get; set; }
    public string name { get; set; }
}

请注意，上述示例代码中的tfsUrl变量应替换为实际的TFS服务器URL，buildRequestId应替换为要查找的构建请求的ID。此外，还需要根据TFS API的版本进行相应的调整。