为什么这样做：
<Button x:Name="btnCritereAdd" Content="{Binding Source={x:Static resx:resMain.lblCriterAdd}}" Style="{StaticResource btnStandardClr}" Click="btnMenuPopup_Click" ContextMenuService.Placement="Bottom">
<Button.ContextMenu>
<ContextMenu x:Name="cmuCriteres">
<ContextMenu.ItemsSource>
<Binding Path="CriteresDispo" />
</ContextMenu.ItemsSource>
<ContextMenu.InputBindings>
<MouseBinding MouseAction="LeftClick" Command="" />
</ContextMenu.InputBindings>
</ContextMenu>
</Button.ContextMenu>
</Button>
但不是这样：
<Button x:Name="btnCritereAdd" Content="{Binding Source={x:Static resx:resMain.lblCriterAdd}}" Style="{StaticResource btnStandardClr}" Click="btnMenuPopup_Click" ContextMenuService.Placement="Bottom">
<Button.ContextMenu>
<ContextMenu x:Name="cmuCriteres">
<ContextMenu.Resources>
<CollectionViewSource x:Key="cvsCriteres" Source="{Binding CriteresDispo}"/>
</ContextMenu.Resources>
<ContextMenu.ItemsSource>
<Binding Source="{StaticResource cvsCriteres}" />
</ContextMenu.ItemsSource>
<ContextMenu.InputBindings>
<MouseBinding MouseAction="LeftClick" Command="" />
</ContextMenu.InputBindings>
</ContextMenu>
</Button.ContextMenu>
</Button>
我在CodeBehind中的Button上设置DataContext：
btnCritereAdd.DataContext = vmFiltresChamps;
我试过＆＃34; UpdateSourceTrigger = PropertyChanged＆＃34;和＃34; NotifyOnSourceUpdated = True＆＃34;关于这两个案子但没有任何改变。 清单是空的......
你有什么想法吗？
VM方面： 属性：
public ItemCollection CriteresDispo { get { return _CriteresDispo; } set { _CriteresDispo = value; RaisePropertyChanged(nameof(CriteresDispo)); } }
由代码调用的命令
public RelayCommand<ItemCollection> LoadCriteresCommand { get; set; }
private void LoadCriteres(ItemCollection obj) {
var ht = new tblFiltreChamps();
Classes.clsUtils.GetFiltresSel(obj, ht);
CriteresDispo = new ItemsControl().Items;
if (ht.items.Count > 0) {
foreach (var item in ht.items.OrderBy((x) => x.Desc).ToList()) {
var mi = new MenuItem() { Header = item.Desc, Tag = item };
mi.Command = AddCritereCommand;
mi.CommandParameter = item;
CriteresDispo.Add(mi);
}
}
if (CriteresAddAction != null) CriteresAddAction();
}
答案 0 :(得分：0)
// Directory crawler
// Written by Kaz
#include<iostream>
#include <dirent.h>
#include<string.h>
#include <errno.h>
#include <stdio.h>
#include<string>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include<stdlib.h>
using namespace std;
int binCount = 0; // count of total bins which are nodes in the linked-list
struct node{
int count, name, min, max;
node* next, *prev;
node(){
name = binCount;
count = 0;
min = 0;
max = 0;
prev = NULL;
next = NULL;
}
node(node *other){
if(other == NULL){
}
else{
node* objCopy = other;
node* temp = this;
while(objCopy != NULL){
temp->next = new node;
temp->next->name = objCopy->name;
temp->next->count = objCopy->count;
temp->next->min = objCopy->min;
temp->next->max = objCopy->max;
temp->next->prev = objCopy->prev;
temp = temp->next;
objCopy = objCopy->next;
}
}
}
};
/*
void nextNode(node* previousNode, int binWidth){
node *nextLink = new node;
nextLink->count = 1;
nextLink->min = previousNode->max + 1;
nextLink->max = previousNode->max + binWidth;
nextLink->prev = previousNode;
previousNode ->next = nextLink;
}
*/
node* traverseNewDirectory(node *here, const char *dirName, int binWidth){
DIR * nwd;
struct dirent *dip;
node * current = new node(here);
// Deep copy?
//current = here;
bool isadirectory,isHidden;
if((nwd = opendir(dirName))== NULL){
perror("Can't open derived directory");
return NULL;
}
while ((dip = readdir(nwd)) != NULL){
isadirectory = false;
isHidden = false;
if((dip -> d_type) == DT_UNKNOWN ){
struct stat stbuf;
stat(dip->d_name, &stbuf);
isadirectory = S_ISDIR(stbuf.st_mode);
}
else if((dip -> d_type) == DT_DIR ){
if((strcmp(dip->d_name, ".") == 0) || (strcmp(dip->d_name, "..")) == 0){
isHidden = true;
isadirectory = true;
}
else{
isadirectory = true;
}
}
else{
if((dip-> d_reclen <= current->max)&&(dip->d_reclen >=current->min)){
current->count = current->count+1;
}
else if(dip->d_reclen < current->min){
node*temp = current->prev;
while(temp != NULL){
if((dip-> d_reclen <= temp->max)&&(dip->d_reclen >=temp->min)){
temp->count = temp->count+1;
break;
}
else if(dip->d_reclen < temp->min){
temp = temp->prev;
}
}
}
else{
current->next = new node;
current->next->count = 1;
current->next->min = current->max + 1;
current->next->max = current->max + binWidth;
current->next->prev = current;
current = current->next;
binCount++;
}
}
if(isadirectory){
string path = string(dirName) + "/"+dip->d_name;
/*
strcpy(path,dirName);
strcat(path, "/");
strcat(path,dip->d_name);
strcat(path, "\0");
*/
if(isHidden == true){}
else{
current->next = new node(traverseNewDirectory(current, path.c_str(), binWidth));
if(current->next != NULL){
current = current->next;
binCount++;
}
}
}
}
while ( ( closedir (nwd) == -1) && ( errno == EINTR) );
if(current == here){
return NULL;
}
else{
return current;
}
}
void printHistogram(node *head){
node*temp;
temp = head;
while(temp!=NULL){
cout << "[B " << temp->name << "] from " << temp->min << " to " << temp->max << " : ";
for(int i = 0; i < temp->count; i++){
cout << "x";
}
cout << endl;
temp = temp->next;
}
}
int main(int argc,char *argv[]){
// Ensures that a valid directory is provided by the cmd line argument
if (argc != 3){
if(argc == 1){
fprintf (stderr, " argc = %d no directory given \n", argc);
return 1;
}
else if(argc == 2){
fprintf (stderr, " argc = %d no size given \n", argc);
return 2;
}
else{
fprintf(stderr, "argc = %d invalid parameters \n", argc);
return 3;
}
}
DIR * cwd; // current working directory pointer
struct dirent *cwdP; // pointer to dirent struct
int binWidth; // variable for the width of the grouping in the histogram
binWidth = atoi(argv[2]);
binWidth = binWidth - 1;
node *first = new node;
first->max = binWidth;
binCount++;
node * current;
current = first;
bool isadirectory,isHidden;
if((cwd = opendir(argv[1]))== NULL){
perror("Can't open main directory");
return 2;
}
while ((cwdP = readdir(cwd)) != NULL){
isadirectory = false;
isHidden = false;
if((cwdP -> d_type) == DT_UNKNOWN ){
struct stat stbuf;
stat(cwdP->d_name, &stbuf);
isadirectory = S_ISDIR(stbuf.st_mode);
}
else if((cwdP -> d_type) == DT_DIR ){
if((strcmp(cwdP->d_name, ".") == 0) || (strcmp(cwdP->d_name, "..")) == 0){
isHidden = true;
isadirectory = true;
}
else{
isadirectory = true;
}
}
else{
if((cwdP-> d_reclen <= current->max)&&(cwdP->d_reclen >=current->min)){
current->count = current->count+1;
}
else if(cwdP->d_reclen < current->min){
node*temp = current->prev;
while(temp != NULL){
if((cwdP-> d_reclen <= temp->max)&&(cwdP->d_reclen >=temp->min)){
temp->count = temp->count+1;
break;
}
else if(cwdP->d_reclen < temp->min){
temp = temp->prev;
}
}
}
else{
/*
nextNode(current,binWidth);
current = current ->next;
//binCount++;
*/
current->next = new node;
current->next->count = 1;
current->next->min = current->max + 1;
current->next->max = current->max + binWidth;
current->next->prev = current;
current = current->next;
binCount++;
}
}
if(isadirectory){
string fullPath = string(argv[1]) + "/" + cwdP ->d_name;
/*
strcpy(path,dirName);
strcat(path, "/");
strcat(path,dip->d_name);
strcat(path, "\0");
*/
if(isHidden == true){}
else{
current->next = new node(traverseNewDirectory(current, fullPath.c_str(), binWidth));
if(current->next != NULL){
current = current->next;
binCount++;
}
}
}
}
while ( ( closedir (cwd) == -1) && ( errno == EINTR) );
printHistogram(first);
return 0;
}
未实现CollectionViewSource，因此无法设置为IEnumerable的{{1}}属性，其类型为ItemsSource。
因此您需要更改：
ContextMenu要：
IEnumerable这会将<ContextMenu.ItemsSource>
<Binding Source="{StaticResource cvsCriteres}"/>
</ContextMenu.ItemsSource>
设置为<ContextMenu.ItemsSource>
<Binding Source="{StaticResource cvsCriteres}" Path="View"/>
</ContextMenu.ItemsSource>
的{{1}}属性，其类型为ItemsSource且 实施CollectionViewSource
答案 1 :(得分：0)
你有什么想法吗？
绑定到StaticResource时，如果为绑定到{{1}的PropertyChanged属性的属性引发Source事件，则不会更新目标属性}}。
这就是区别。
您需要绑定到属性，并为CollectonViewSource集合的此特定属性引发PropertyChanged事件以进行刷新。