我想获取所有Azure Table错误的列表,并找出一种在try...catch
块中处理它们的简洁方法。
例如,我不想直接编码并将InnerException消息与String.Contains("The specified entity already exists")
进行比较。捕获这些错误的正确方法是什么?
答案 0 :(得分:3)
您可以尝试查看Response中的值,而不是内部异常。这是我的一个try catch块的一个例子:
try {
return query.FirstOrDefault();
}
catch (System.Data.Services.Client.DataServiceQueryException ex)
{
if (ex.Response.StatusCode == (int)System.Net.HttpStatusCode.NotFound) {
return null;
}
throw;
}
显然这只是因为项目不存在错误,但我相信你可以通过查看list of Azure error codes来扩展这个概念。
答案 1 :(得分:3)
要在向表中添加对象时处理错误,可以使用以下代码:
try {
_context.AddObject(TableName, entityObject);
_context.SaveCangesWithRetries();
}
catch(DataServiceRequestException ex) {
ex.Response.Any(r => r.StatusCode == (int)System.Net.HttpStatusCode.Conflict)
throw;
}
如在其他答案中所述,您可以在以下位置找到TableStorage错误列表:http://msdn.microsoft.com/en-us/library/dd179438.aspx
答案 2 :(得分:2)
请在此处查看我的代码:http://blog.smarx.com/posts/testing-existence-of-a-windows-azure-blob。模式是捕获StorageClientException,然后使用.ErrorCode属性来匹配StorageErrorCode中的常量。
答案 3 :(得分:1)
以下是Azure Table Whitepaper中提供的代码,但我不确定这是否对smark的回复有任何价值。
/*
From Azure table whitepaper
When an exception occurs, you can extract the sequence number (highlighted above) of the command that caused the transaction to fail as follows:
try
{
// ... save changes
}
catch (InvalidOperationException e)
{
DataServiceClientException dsce = e.InnerException as DataServiceClientException;
int? commandIndex;
string errorMessage;
ParseErrorDetails(dsce, out commandIndex, out errorMessage);
}
*/
-
void ParseErrorDetails( DataServiceClientException e, out string errorCode, out int? commandIndex, out string errorMessage)
{
GetErrorInformation(e.Message, out errorCode, out errorMessage);
commandIndex = null;
int indexOfSeparator = errorMessage.IndexOf(':');
if (indexOfSeparator > 0)
{
int temp;
if (Int32.TryParse(errorMessage.Substring(0, indexOfSeparator), out temp))
{
commandIndex = temp;
errorMessage = errorMessage.Substring(indexOfSeparator + 1);
}
}
}
void GetErrorInformation( string xmlErrorMessage, out string errorCode, out string message)
{
message = null;
errorCode = null;
XName xnErrorCode = XName.Get("code", "http://schemas.microsoft.com/ado/2007/08/dataservices/metadata");
XName xnMessage = XName.Get ( "message", "http://schemas.microsoft.com/ado/2007/08/dataservices/metadata");
using (StringReader reader = new StringReader(xmlErrorMessage))
{
XDocument xDocument = null;
try
{
xDocument = XDocument.Load(reader);
}
catch (XmlException)
{
// The XML could not be parsed. This could happen either because the connection
// could not be made to the server, or if the response did not contain the
// error details (for example, if the response status code was neither a failure
// nor a success, but a 3XX code such as NotModified.
return;
}
XElement errorCodeElement = xDocument.Descendants(xnErrorCode).FirstOrDefault();
if (errorCodeElement == null)
{
return;
}
errorCode = errorCodeElement.Value;
XElement messageElement = xDocument.Descendants(xnMessage).FirstOrDefault();
if (messageElement != null)
{
message = messageElement.Value;
}
}
}