我在SQL过程中生成raise错误:
RAISERROR('Already exist',-10,-10)
但我无法在C#中使用以下代码捕获它
catch (SqlException ex)
{
bResult = false;
if (ex.Errors[0].Number == -10)
{
CommonTools.vAddToLog("bInsertNewUser", "ManageUsers", ex.Message);
if ((savePoint != null))
savePoint.Rollback();
}
}
如何捕获C#中引发的错误？
什么是优势和劣势的每一个Response.End()和CompleteRequest()？我应该在哪里和不应该使用它们？我找了这个问题,但我没有得到正确答案.
我使用以下代码从 Amazon S3 读取文本文件，并逐行处理它。这段代码可以工作，但问题是速度很慢。
GetObjectRequest getObjRequest = new GetObjectRequest()
.WithBucketName(amazonSettings.BucketName)
.WithKey(_fileKey);
using (AmazonS3 client = AWSClientFactory.CreateAmazonS3Client(
amazonSettings.AccessKey,
amazonSettings.SecretAccessKey))
using (GetObjectResponse getObjRespone = client.GetObject(getObjRequest))
using (Stream amazonStream = getObjRespone.ResponseStream)
{
StreamReader amazonStreamReader = new StreamReader(amazonStream);
tempGsContact = new GSContact();
while ((_fileLine = amazonStreamReader.ReadLine()) != null)
{
if (_fileLine.Equals("END:VCARD"))
{
// Make process 1
}
else if (!_fileLine.Equals(string.Empty))
{
//Make process 2
}
}
}
问题是：我能否得到更充分的方式来降低时间成本？
我在JavaScript中使用drop事件使用以下代码上传文件:
var fileName = event.dataTransfer.files[0].name;
var orgValue = document.getElementById('<%=tbfilesCollections.ClientID%>').value;
if (orgValue == 'undefined') {
orgValue = '';
}
orgValue += orgValue == '' ? '' : '\n';
orgValue += "*" + fileName;
document.getElementById('<%=tbfilesCollections.ClientID%>').value = orgValue;
event.preventDefault();
return false;
但是这段代码只获取文件名...我需要获取文件的完整路径.
如果遇到逻辑错误错误(Expired user, invalid ID),那么从以下方面告诉父方法此错误的最佳方法是什么:
1-抛出自定义异常,如下所示:
try
{
//if (ID doesn't match) then
Throw new CustomException(-1,"ID doesn't match");
}
catch(CustomException ex)
{
throw ex
}
catch(Exception ex)
{
throw new CustomException(ex.ErrorCode,ex.message);
}
2-返回错误消息和代码如:
//if (ID doesn't match) then
This.ErrorCode= -1;
This.Message= "ID doesn't match";
在以下存储过程中,我遇到了一个错误:
DROP PROCEDURE IF EXISTS `SP_DeleteFileInfo`;
CREATE PROCEDURE `SP_DeleteFileInfo`(pFileID int)
Set @FileRef= null;
select filesinfo.ReferenceID into @FileRef FROM filesinfo where filesinfo.FileID =pFileID;
DELETE From filesinfo
WHERE filesinfo.FileID= pFileID;
IF EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= @FileRef and filesrefrences.RefrenceCount>1) then
update filesrefrences
set
filesrefrences.RefrenceCount= filesrefrences.RefrenceCount-1
where
filesrefrences.ReferenceID= @FileRef;
SELECT @FileRef;
ELSE IF(@FileRef is Not NULL) THEN
DELETE from filesrefrences WHERE filesrefrences.ReferenceID = @FileRef;
SELECT -77;
ELSE
SELECT -99;
end if;
遇到的错误是:
[SQL]
select filesinfo.ReferenceID into @FileRef FROM filesinfo where filesinfo.FileID =pFileID; …我如何重写以下 SP 来面对 MySQL 中的递归限制：
CREATE DEFINER = `root`@`localhost` PROCEDURE `SP_DeleteParentDirectory`(pParentID INT,pIsFolder INT,pReferenceID INT)
BEGIN
SET @@SESSION.max_sp_recursion_depth = 255;
SET @IsFolder= NULL;
SET @ChildID= NULL;
SET @ReferenceID= NULL;
IF ( pIsFolder= 2) THEN
SELECT FileID INTO @ChildID FROM filesinfo WHERE ParentID= pParentID LIMIT 1;
WHILE (@ChildID IS NOT NULL) DO
SELECT filesinfo.IsFolder,filesinfo.ReferenceID INTO @IsFolder,@ReferenceID FROM filesinfo WHERE filesinfo.FileID = @ChildID;
CALL SP_DeleteParentDirectory(@ChildID,@IsFolder,@ReferenceID);
SELECT filesinfo.FileID INTO @ChildID FROM filesinfo WHERE ParentID= pParentID LIMIT 1;
END While;
END IF;
DELETE FROM filesinfo …我需要知道是否Response.Clear()只是清除内容还是删除标题？换句话说,如果我使用Response.Clear(),我是否还需要使用Response.ClearHeader()？
try
{
// throws IOException
}
catch(Exception e)
{
}
catch(IOException e)
{
}
当try块抛出时IOException,它将调用第一个catch块而不是第二个块.任何人都可以解释这一点.为什么它会调用第catch一块？
我使用.net 4.0 c#开发了新服务,我现在要安装到不包含visual studio命令promot和installUtil.exe的托管服务器.如何将服务安装到服务器？需要安装VS版本吗？