Windows 8.1 Metro应用程序中的本地AppData监视器（StorageFileQueryResult.ContentsChanged事件未触发）

监视器如何处理AppData文件夹中的特定文件

我曾尝试使用StorageFolderQueryResult.ContentsChanged事件来处理此问题，但此事件实际上会回调文件夹中的任何更改

     auto fileTypeFilter = ref new Platform::Collections::Vector<Platform::String^>();
fileTypeFilter->Append("*");

auto queryOptions = ref new QueryOptions(CommonFileQuery::OrderBySearchRank, fileTypeFilter);
//use the user's input to make a query
queryOptions->UserSearchFilter = InputTextBox->Text;
auto queryResult = musicFolder->CreateFileQueryWithOptions(queryOptions);


auto localFolder = ApplicationData::Current->LocalFolder;
auto currPath = localFolder->Path;
auto fileTypeFilter = ref new Platform::Collections::Vector<Platform::String^>();
fileTypeFilter->Append(".dat");

auto queryOptions = ref new QueryOptions(CommonFileQuery::OrderByName, fileTypeFilter);
//use the user's input to make a query
queryOptions->UserSearchFilter = L"filename";
auto queryResult = localFolder->CreateFileQueryWithOptions(queryOptions);
queryResult->ContentsChanged += ref new TypedEventHandler<IStorageQueryResultBase^,        Platform::Object^>(this, &Scenario1::OnLocalAppDataChanged);
     //find all files that match the query
 create_task(queryResult->GetFilesAsync()).then([this, queryOptions]    (IVectorView<StorageFile^>^ files)
    {
        String^ outputText = "";
        //output how many files that match the query were found
        if ( files->Size == 0)
     {
         outputText += "No files found for '" + queryOptions->UserSearchFilter + "'";
    }
    else if (files->Size == 1)
    {
        outputText += files->Size.ToString() + " file found:\n\n";
    }
    else
    {
        outputText += files->Size.ToString() + " files found:\n\n";
    }
    //output the name of each file that matches the query
    for (unsigned int i = 0; i < files->Size; i++)
    {
        outputText += files->GetAt(i)->Name + "\n";
    }
    OutputTextBlock->Text = outputText;
});
}
void Scenario1::OnLocalAppDataChanged(Windows::Storage::Search::IStorageQueryResultBase^ sender, Platform::Object^ args)
{
Platform::String^ hello = L"hello world, I'm called back";
}

我的问题是只监视单个文件，并在其更改时使用eventhandler

我尝试使用这个“UserSearchFilter”属性来查询选项。那实际上不起作用

有人能帮忙吗？如果您可以另外提供整个问题的语法，这也会很有帮助

修改文件夹中的“文件名”时未触发My contentschanged事件

     auto fileTypeFilter = ref new Platform::Collections::Vector<Platform::String^>();
fileTypeFilter->Append("*");

auto queryOptions = ref new QueryOptions(CommonFileQuery::OrderBySearchRank, fileTypeFilter);
//use the user's input to make a query
queryOptions->UserSearchFilter = InputTextBox->Text;
auto queryResult = musicFolder->CreateFileQueryWithOptions(queryOptions);


auto localFolder = ApplicationData::Current->LocalFolder;
auto currPath = localFolder->Path;
auto fileTypeFilter = ref new Platform::Collections::Vector<Platform::String^>();
fileTypeFilter->Append(".dat");

auto queryOptions = ref new QueryOptions(CommonFileQuery::OrderByName, fileTypeFilter);
//use the user's input to make a query
queryOptions->UserSearchFilter = L"filename";
auto queryResult = localFolder->CreateFileQueryWithOptions(queryOptions);
queryResult->ContentsChanged += ref new TypedEventHandler<IStorageQueryResultBase^,        Platform::Object^>(this, &Scenario1::OnLocalAppDataChanged);
     //find all files that match the query
 create_task(queryResult->GetFilesAsync()).then([this, queryOptions]    (IVectorView<StorageFile^>^ files)
    {
        String^ outputText = "";
        //output how many files that match the query were found
        if ( files->Size == 0)
     {
         outputText += "No files found for '" + queryOptions->UserSearchFilter + "'";
    }
    else if (files->Size == 1)
    {
        outputText += files->Size.ToString() + " file found:\n\n";
    }
    else
    {
        outputText += files->Size.ToString() + " files found:\n\n";
    }
    //output the name of each file that matches the query
    for (unsigned int i = 0; i < files->Size; i++)
    {
        outputText += files->GetAt(i)->Name + "\n";
    }
    OutputTextBlock->Text = outputText;
});
}
void Scenario1::OnLocalAppDataChanged(Windows::Storage::Search::IStorageQueryResultBase^ sender, Platform::Object^ args)
{
Platform::String^ hello = L"hello world, I'm called back";
}

auto-fileTypeFilter=ref新平台：：集合：：向量（）；
fileTypeFilter->追加（“*”）；
自动查询选项=引用新查询选项（CommonFileQuery:：OrderBySearchRank，fileTypeFilter）；
//使用用户的输入进行查询
查询选项->用户搜索过滤器=输入文本框->文本；
自动查询结果=musicFolder->CreateFileQueryWithOptions（查询选项）；
auto localFolder=ApplicationData:：Current->localFolder；
自动currPath=localFolder->Path；
自动fileTypeFilter=ref新平台：：集合：：向量（）；
fileTypeFilter->Append（“.dat”）；
自动查询选项=引用新查询选项（CommonFileQuery:：OrderByName，fileTypeFilter）；
//使用用户的输入进行查询
queryOptions->UserSearchFilter=L“文件名”；
auto queryResult=localFolder->CreateFileQueryWithOptions（查询选项）；
queryResult->ContentsChanged+=ref新类型deventhandler（此，&Scenario1:：OnLocalAppDataChanged）；
//查找与查询匹配的所有文件
创建任务（queryResult->GetFileAsync（））。然后（[这个，queryOptions]（IVectorView^文件）
{
字符串^outputText=“”；
//输出找到的与查询匹配的文件数
如果（文件->大小==0）
{
outputText+=“未找到'”+queryOptions->UserSearchFilter+“'的文件”；
}
else if（文件->大小==1）
{
outputText+=文件->大小.ToString（）+“找到文件：\n\n”；
}
其他的
{
outputText+=文件->大小.ToString（）+“找到的文件：\n\n”；
}
//输出与查询匹配的每个文件的名称
对于（无符号整数i=0；iSize；i++）
{
outputText+=files->GetAt（i）->Name+“\n”；
}
OutputExtBlock->Text=输出文本；
});
}
void Scenario1:：OnLocalAppDataChanged（Windows:：Storage:：Search:：IStorageQueryResultBase^发件人，平台：：对象^args）
{
平台：：字符串^hello=L“你好，世界，我被叫回来了”；
}

必须至少调用一次getFileAsync（）方法，否则事件将永远不会触发

加

以前

queryResult->ContentsChanged += ref new TypedEventHandler<IStorageQueryResultBase^,...

queryResult->ContentsChanged+=ref新类型deventhandler