我试图检查我的var中的null,但它抛出"对象引用未设置为对象的实例".
private void GenerateImage()
{
//Webster.Client.Modules.Metadata.Helper test = new Webster.Client.Modules.Metadata.Helper();
var selectedstory = Webster.Client.Modules.Metadata.Helper.SelectedStoryItem;
if((selectedstory.Slug).Trim()!=null)
{
//if (!string.IsNullOrEmpty(selectedstory.Slug))
//{
if (File.Exists(pathToImage))
{
}
else
{
this.dialog.ShowError("Image file does not exist at the specified location", null);
}
}
else
{
this.dialog.ShowError("Slug is Empty,please enter the Slug name", null);
}
}
我知道selectedstory.Slug有空值,这就是为什么我用if条件来检查,但是它在if条件下正好扔了.
有人可以建议检查什么是正确的方法.
我试图从C#通过Linq删除一个sql表记录但是有些原因DeleteonSubmit没有被重新认识,我不确定我在这里缺少什么,请指导我正确的方法
这是我的代码
proxy = new ServiceClient("basicHttp_IService");
//GatewayService.ServiceClient proxy = new ServiceClient("basicHttp_IService");
SearchCriteria criteria = new SearchCriteria();
criteria.UserRoles = new string[] { "*" };
var stories = proxy.GetStoryItemsByCriteria(criteria);
var programs = proxy.GetPrograms();
var Profiles = proxy.GetProfiles();
foreach(StoryProgram sp in lstStoriestoClose)
{
try
{
DateTime LastUpdateTimestamp;
DateTime CurrentTime = DateTime.Now;
LastUpdateTimestamp = sp.Story.LastUpdatedOn;
if ((CurrentTime - LastUpdateTimestamp).TotalHours > 24)
{
//Delete the story from database
var storytoDelete = from story in stories
where story.Id == sp.Story.Id
select story;
//I am trying to …我使用Log4Net来记录我的应用程序,一切正常,我只想了解更多有关日志详细信息的信息.
这是我的日志:
2012-05-22 17:11:44,602 **[11]** ERROR Shell Exists - ignoreThe remote server returned an erro:
2012-05-29 15:48:11,876 **[32]** ERROR Shell Exists - ignoreThe remote server returned an error: (550) File unavailable (e.g., file not found, no access).
这是我的配置:
<appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender,log4net">
<appendToFile value="true" />
<maxSizeRollBackups value="30" />
<maximumFileSize value="5MB" />
<rollingStyle value="Size" />
<staticLogFileName value="false" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<file value="c:\Error.log"/>
<param name="AppendToFile" value="true"/>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ERROR"/>
<param name="LevelMax" value="ERROR"/>
</filter>
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-2p …我可能会因此得到负面评价，但仍然得到专家的一些评论或建议对我来说是更多的知识，所以这是我的问题。
这里我返回一个字符串
public static string mystring()
{
return "test";
}
有没有最好的方法来返回字符串或者我的返回有什么缺点？
我真的很难解决这个问题
public bool DeleteVegetationZone(ref Assessment objAssessment, int VegetationZoneIDToDelete, string UserFullname, ref string ErrorMessage)
{
string RowFilter = @"VegetationZoneID=" + Convert.ToString(VegetationZoneIDToDelete);
Assessment.tblVegetationZoneRow[] VegetationZoneRows = (Assessment.tblVegetationZoneRow[])objAssessment.tblVegetationZone.Select(RowFilter);
if ((VegetationZoneRows != null) && (VegetationZoneRows.Length != 0))
{
if (VegetationZoneRows.Length == 1)
{
if (VegetationZoneRows[0].VegetationZoneID > 0)
{
VegetationZoneRows[0].UpdatedBySystemUser = UserFullname;
VegetationZoneRows[0].SaveType = (int)EnumCollection.SaveType.RemoveOnly;
}
else
{
VegetationZoneRows[0].Delete();
objAssessment.AcceptChanges();
}
//tblThreatenedSpeciesSubzone
var list = objAssessment.tblThreatenedSpeciesSubzone.Rows.ToList();
for (int i = 0; i < objAssessment.tblThreatenedSpeciesSubzone.Count; i++)
{
foreach (Assessment.tblThreatenedSpeciesSubzoneRow ThreatenedSpeciesSubzoneRow in objAssessment.tblThreatenedSpeciesSubzone.Rows)
{
if (ThreatenedSpeciesSubzoneRow.VegetationZoneID == VegetationZoneIDToDelete) …在我的C#项目中使用Mediainfo库,在开始调用这个dll之前,我刚刚运行了包中附带的VC++程序并部署到我的本地system.am不确定它在部署时究竟做了什么,它在系统中注册了一些东西,所以我的进程可以识别mediainfo.dll,所以它在我的本地(32位)运行良好.
当我开始在Testserver中部署时,我无法运行或部署VC++(bcoz测试服务器除了调试器之外没有Visual Studio这样做.)我收到此错误
public class MediaInfo
{
//Import of DLL functions. DO NOT USE until you know what you do (MediaInfo DLL do NOT use CoTaskMemAlloc to allocate memory)
[DllImport("MediaInfo.dll")]
private static extern IntPtr MediaInfo_New();
//MediaInfo class
public String Inform()
{
if (Handle == (IntPtr)0)
return "Unable to load MediaInfo library";
if (MustUseAnsi)
return Marshal.PtrToStringAnsi(MediaInfoA_Inform(Handle, (IntPtr)0));
else
return Marshal.PtrToStringUni(MediaInfo_Inform(Handle, (IntPtr)0));
}
public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo, InfoKind KindOfSearch)
{
if (Handle == (IntPtr)0)
return "Unable …我试图编写一个控制台应用程序,根据开始日期按升序排序我的日期和时间,这是我要做的一个例子.
我的意见:
break Start1 = 15/02/12 12.30PM break End1= 15/02/12 01.30PM break Start2 = 15/02/12 11.00AM break End2= 15/02/12 12.00PM break Start3 = 15/02/12 12.00PM break End3= 15/02/12 01.00PM
我期待我的输出应该像:
break Start1 = 15/02/12 11.00AM break End1= 15/02/12 12.00PM break Start2 = 15/02/12 12.00PM break End2= 15/02/12 01.00PM break Start3 = 15/02/12 12.30PM break End3= 15/02/12 01.30PM
请建议我解决这个问题的最佳方法？