Silverlight 4应用程序的问题。 在此应用程序中,每个客户端会话都会创建一个单独的进程,该进程调用DLL。
与DLL的通信构建如下面的callstack(对于两个函数:一个工作,另一个 - 不是。)
DLL中有两个函数(两者都可以正常工作):
extern "C" BOOL __stdcall DocRunExternPageDividions(const char *docId, int num_form, int PageNum, int *Vcols, int **Vvalues, int *Hcols, int **Hvalues)
{
LOG_START_FUNCTION
BOOL res = 1;
__try {
res = DocRunExternPageDividions1(docId, num_form, PageNum, Vcols, Vvalues, Hcols, Hvalues);
}
__except(ExFilter(GetExceptionInformation()))
{
AfxThrowUserException();
}
LOG_STOP_FUNCTION
return res;
}
extern "C" BOOL __stdcall DocRunExternPageBreakRects(const char *docId, int num_form, int PageNum)
{
LOG_START_FUNCTION
BOOL res = 1;
__try {
res = DocRunExternPageBreakRects1(docId, num_form, PageNum);
}
__except(ExFilter(GetExceptionInformation()))
{
AfxThrowUserException();
}
LOG_STOP_FUNCTION
return res;
}
要调用此函数,服务器有两个代理:
private delegate void DocRunExternPageBreakRectsDelegate(string docId, int DocNum, int PageNum);
private delegate void DocRunExternPageDividionsDelegate(
string docId, int DocNum, int PageNum, out int Vcols, out IntPtr VoutArray, out int Hcols,
out IntPtr HoutArray);
......两个委托实例和相应的函数:
private DocRunExternPageBreakRectsDelegate DocRunExternPageBreakRectsD;
DocRunExternPageBreakRectsD =
Marshal.GetDelegateForFunctionPointer(ptrDocRunExternPageBreakRects,
typeof (DocRunExternPageBreakRectsDelegate)) as
DocRunExternPageBreakRectsDelegate;
private DocRunExternPageDividionsDelegate DocRunExternPageDividionsD;
DocRunExternPageDividionsD =
Marshal.GetDelegateForFunctionPointer(ptrDocRunExternPageDividionsD,
typeof (DocRunExternPageDividionsDelegate)) as
DocRunExternPageDividionsDelegate;
public void DocRunExternPageDividions(string docId, int DocNum, int PageNum, out int[] vert, out int[] horz) {
IntPtr VoutArray, HoutArray;
int vcols, hcols;
DocRunExternPageDividionsD(docId, DocNum, PageNum, out vcols, out VoutArray, out hcols, out HoutArray);
marshal(VoutArray, out vert, vcols);
marshal(HoutArray, out horz, hcols);
}
public void DocRunExternPageBreakRects(string docId, int DocNum, int PageNum) {
DocRunExternPageBreakRectsD(docId, DocNum, PageNum);
}
这里调用这些函数中的每一个(服务器代码):
public bool PageBreakRects(string docId, int DocNum, int PageNum, out int[] vert, out int[] horz) {
bool result;
vert = null;
horz = null;
Program.WriteUserMessage("Called PageBreakRects(" + docId + ", " + DocNum + ", " + PageNum + ")");
try {
DocRunExternPageBreakRects(docId, DocNum, PageNum);
DocRunExternPageDividions(docId, 0, PageNum, out vert, out horz);
result = true;
} catch (Exception ex) {}
return result;
}
public bool GetPageDividions(string docID, int Id, int pageNumber, out int[] vert, out int[] horz) {
bool result = false;
vert = null;
horz = null;
try {
DocRunExternPageDividions(docID, Id, pageNumber, out vert, out horz);
result = true;
} catch (Exception) {}
return result;
}
他们每个人都在这里被称为:
public DocDividionsResult PageBreakRects(string docID, int DocNum, int pageNumber) {
var result = new DocDividionsResult();
int[] vert;
int[] horz;
result.Data = new List<object> { Program.DllWrapper.PageBreakRects(docID, DocNum, pageNumber, out vert, out horz) };
result.Vert = vert;
result.Horz = horz;
return result;
}
public DocDividionsResult GetPageDividions(string docID, int formId, int pageNumber) {
var result = new DocDividionsResult();
int[] vert;
int[] horz;
result.Data = new List<object>
{Program.DllWrapper.GetPageDividions(docID, formId, pageNumber, out vert, out horz)};
result.Vert = vert;
result.Horz = horz;
return result;
}
然后 - 在lambda表达式中:
public bool GetPageDividions(string docID, int formId, int pageNumber, out int[] vert, out int[] horz) {
bool result = false;
int []localVert = null;
int []localHorz = null;
if (_wp != null) {
if (Service<IWPCommunication>.Use(TestService =>
{
TestService.Test(UserId);
},
WPService =>
{
DocDividionsResult br = WPService.GetPageDividions(docID, formId, pageNumber);
if (br != null && br.Data != null && br.Data.Length == 1)
{
result = (bool)br.Data[0];
localVert = br.Vert;
localHorz = br.Horz;
}
}, Id, FS) == 0)
{
...
result = false;
}
}
vert = localVert;
horz = localHorz;
return result;
}
public bool PageBreakRects(string docId, int DocNum, int PageNum) {
bool result = false;
if (_wp != null)
{
if (Service<IWPCommunication>.Use(TestService =>
{
TestService.Test(UserId);
},
WPService =>
{
DocDividionsResult br = WPService.PageBreakRects(docId, DocNum, PageNum);
if (br != null && br.Data != null && br.Data.Length == 1) {
result = (bool)br.Data[0];
}
}, Id, FS) == 0)
{
...
result = false;
}
}
return result;
}
“使用”功能(上面使用):
public static int Use(UseServiceDelegate<T> codeTest, UseServiceDelegate<T> codeBlock, string SessionId, FileStream fs, bool throwException) {
IClientChannel texy = (IClientChannel)_testFactory.CreateChannel(new EndpointAddress("net.pipe://localhost/X2WPServiceUID" + SessionId));
IClientChannel proxy = (IClientChannel)_channelFactory.CreateChannel(new EndpointAddress("net.pipe://localhost/X2WPServiceUID" + SessionId));
int returnCode = 0;
try {
if (codeTest != null) {
codeTest((T)texy);
texy.Close();
}
returnCode = 1;
if (codeBlock != null) {
codeBlock((T)proxy);
proxy.Close();
}
returnCode = 2;
} catch(Exception e) {
if (returnCode == 1 && throwException)
throw e;
} finally {
if (returnCode == 0 && codeTest != null)
texy.Abort();
else if (returnCode == 1 && codeBlock != null)
proxy.Abort();
}
return returnCode;
}
由于服务器端引发了异常,因此省略了客户端通信。 GetPageDividions函数工作正常,错误PageBreakRects - 不是:行 DocDividionsResult br = WPService.PageBreakRects(docId,DocNum,PageNum); 抛出以下异常:
"The message with Action 'http://tempuri.org/IWPCommunication/PageBreakRects'
cannot be processed at the receiver, due to a ContractFilter mismatch at the EndpointDispatcher.
This may be because of either a contract mismatch (mismatched Actions between sender and receiver)
or a binding/security mismatch between the sender and the receiver.
Check that sender and receiver have the same contract and the same binding
(including security requirements, e.g. Message, Transport, None)."
更糟糕的是,如果在函数PageBreakRects中替换: DocDividionsResult br = WPService.PageBreakRects(docId,DocNum,PageNum); 同 DocDividionsResult br = WPService.GetPageDividions(docID,formId,pageNumber); 然后没有抛出异常。
答案 0 :(得分:1)
不确定您是否从一开始就开始,但我希望您发布的所有代码都不会导致错误。该错误意味着您无法从客户端调用Web服务(Silverlight),因为Web配置中的system.serviceModel部分中存在错误。您通常只需刷新服务参考即可解决此问题。
尝试在visual studio中本地运行应用程序并将服务引用指向您在服务器上安装的服务(右键单击服务引用并选择配置服务引用,然后将URl更改为与服务器上的服务位置相对应) 。如果您已在此配置中开发/测试,请尝试右键单击服务引用并选择“更新服务引用”。