我们使用 elmah 已经有一段时间了，我们有一个新的要求，即用户界面不要直接将信息保存到他的数据库中，团队经理询问我们是否可以告诉 elmah 将异常信息发送到 Web 服务。有没有人做过这个或者有任何信息可以分享，谢谢。
【问题讨论】：
标签： elmah.mvc
我实现了这个希望它可以帮助某人：
网络服务：
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Mail;
using System.Web.Http;
using System.Xml;
using System.Xml.Linq;
using Elmah;
using Newtonsoft.Json;
namespace ElmahExt.Service.Controllers
{
public class ElmahCommandsController : ApiController
{
private readonly string _connection = ConfigurationManager.ConnectionStrings["conSQL"].ConnectionString ;
[HttpPost]
public HttpResponseMessage LogError(Error elmahErrorInformation)
{
try
{
var id = Guid.NewGuid();
using (SqlConnection cnn = new SqlConnection(_connection))
using (SqlCommand cmd = SqlCommands.LogError(elmahErrorInformation,id.ToString()))
{
cmd.Connection = cnn;
cnn.Open();
cmd.ExecuteNonQuery();
return Request.CreateResponse(HttpStatusCode.OK, id.ToString());
}
}
catch
{
return Request.CreateResponse(HttpStatusCode.ExpectationFailed,string.Empty);
}
}
[HttpGet]
public HttpResponseMessage GetErrors(string appName, int pageIndex, int pageSize)
{
using (SqlConnection cnn = new SqlConnection(_connection))
using (SqlCommand cmd = SqlCommands.GetErrorsXml(appName, pageIndex, pageSize))
{
cmd.Connection = cnn;
cnn.Open();
XmlReader reader = cmd.ExecuteXmlReader();
try
{
int? total =(int?)cmd.Parameters["@TotalCount"].Value ?? 0;
List<string> errors = new List<string>();
while (reader.IsStartElement("error"))
errors.Add(reader.ReadOuterXml());
XDocument doc = new XDocument(
new XElement("GetErrorsResult",
new XAttribute("total", total),
from string error in errors
select new XElement("Error", error)
)
);
return Request.CreateResponse(HttpStatusCode.OK, doc.ToString());
}
finally
{
reader.Close();
}
}
}
[HttpGet]
public HttpResponseMessage GetError(string appName, string id)
{
Guid errorGuid = new Guid(id);
string errorXml;
using (SqlConnection cnn = new SqlConnection(_connection))
using (SqlCommand cmd = SqlCommands.GetErrorXml(appName, errorGuid))
{
cmd.Connection = cnn;
cnn.Open();
errorXml = (string)cmd.ExecuteScalar();
}
XElement errorEl = (errorXml == null) ? null : new XElement("Error", errorXml);
XDocument doc = new XDocument(
new XElement("GetErrorResult", errorEl)
);
return Request.CreateResponse(HttpStatusCode.OK, doc.ToString());
}
}
}
Elmah 扩展
using System;
using System.Collections;
using System.Linq;
using System.Net.Http;
using System.Net.Mail;
using System.Threading.Tasks;
using System.Xml.Linq;
using Elmah;
namespace ElmahExt
{
public class ServiceErrorLog : ErrorLog
{
private string _url;
public ServiceErrorLog(IDictionary config)
{
\\Here config have the information from the configuration in the web config
ApplicationName = config["applicationName"] as string ?? "";
_url = config["WebServiceUrl"] as string ?? "";
}
static ServiceErrorLog()
{
TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException;
}
private static void TaskScheduler_UnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e)
{
e.SetObserved();
}
public override string Name => "Custom Elmah provider using web services.";
/// <summary>
/// This method log the error information coming from an Elmah call. The result of the web service is received with the guid id of the error but is not waited or returned.
/// This implementation was on purpose to continue the processing.
/// </summary>
/// <param name="error">Elmah object containing all the information of the exception</param>
/// <returns></returns>
public override string Log(Error error)
{
Task T = Task.Factory.StartNew(() =>
{
using (var client = new HttpClient())
{
var result = client.PostAsJsonAsync(_url, error).Result;
}
});
return string.Empty;
}
/// <summary>
/// Return a list of errors to display in the Elmah viewer.
/// </summary>
/// <param name="pageIndex">The index of the page to display</param>
/// <param name="pageSize">The amount of records to display per page</param>
/// <param name="errorEntryList">The list of errors</param>
/// <returns>A list of errors in XML format.</returns>
public override int GetErrors(int pageIndex, int pageSize, IList errorEntryList)
{
int total = 0;
using (var client = new HttpClient())
{
_url += $"?pageIndex={pageIndex}&pageSize={pageSize}&appName={ApplicationName}";
var response = client.GetAsync(_url).Result;
if (response.IsSuccessStatusCode)
{
var result = response.Content.ReadAsAsync<string>().Result;
XDocument doc = XDocument.Parse(result);
XElement root = doc.Element("GetErrorsResult");
if (root != null)
{
var errors = from XElement el in root.Elements("Error")
select new
{
value = el.Value,
element = XElement.Parse(el.Value)
};
foreach (var err in errors)
{
string errorId = err.element.Attribute("errorId").Value;
Error error = ErrorXml.DecodeString(err.value);
errorEntryList.Add(new ErrorLogEntry(this, errorId, error));
}
total = int.Parse(root.Attribute("total").Value);
}
}
}
return total;
}
/// <summary>
/// Returns an specific error
/// </summary>
/// <param name="id">The id of the error.(Guid)</param>
/// <returns>Returns an XML with the error information.</returns>
public override ErrorLogEntry GetError(string id)
{
ErrorLogEntry errorLogEntry = null;
using (var client = new HttpClient())
{
_url += $"?id={id}&appName={ApplicationName}";
var response = client.GetAsync(_url).Result;
if (response.IsSuccessStatusCode)
{
var result = response.Content.ReadAsAsync<string>().Result;
XDocument doc = XDocument.Parse(result);
XElement root = doc.Element("GetErrorResult");
XElement errorEl = root?.Element("Error");
if (errorEl != null)
{
Error error = ErrorXml.DecodeString(errorEl.Value);
errorLogEntry = new ErrorLogEntry(this, id, error);
}
}
}
return errorLogEntry;
}
}
}
在您的网络配置中必须添加自定义提供程序：
<errorLog type="ElmahExt.ServiceErrorLog, ElmahExt" applicationName="Elmah Evaluation App"
WebServiceUrl="http://localhost:28382/api/ElmahCommands/LogError" />
在此配置部分中注意 Web 服务 url 的变量和自定义提供程序的构造函数中使用的应用程序的名称。
【讨论】：