本文整理汇总了C#中System.WeakReference类的典型用法代码示例。如果您正苦于以下问题：C# WeakReference类的具体用法？C# WeakReference怎么用？C# WeakReference使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
WeakReference类属于System命名空间，在下文中一共展示了WeakReference类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
// Create the cache.
int cacheSize = 50;
Random r = new Random();
Cache c = new Cache(cacheSize);
string DataName = "";
GC.Collect(0);
// Randomly access objects in the cache.
for (int i = 0; i < c.Count; i++) {
int index = r.Next(c.Count);
// Access the object by getting a property value.
DataName = c[index].Name;
}
// Show results.
double regenPercent = c.RegenerationCount/(double)c.Count;
Console.WriteLine("Cache size: {0}, Regenerated: {1:P2}%", c.Count, regenPercent);
}
}
public class Cache
{
// Dictionary to contain the cache.
static Dictionary<int, WeakReference> _cache;
// Track the number of times an object is regenerated.
int regenCount = 0;
public Cache(int count)
{
_cache = new Dictionary<int, WeakReference>();
// Add objects with a short weak reference to the cache.
for (int i = 0; i < count; i++) {
_cache.Add(i, new WeakReference(new Data(i), false));
}
}
// Number of items in the cache.
public int Count
{
get { return _cache.Count; }
}
// Number of times an object needs to be regenerated.
public int RegenerationCount
{
get { return regenCount; }
}
// Retrieve a data object from the cache.
public Data this[int index]
{
get {
Data d = _cache[index].Target as Data;
if (d == null) {
// If the object was reclaimed, generate a new one.
Console.WriteLine("Regenerate object at {0}: Yes", index);
d = new Data(index);
_cache[index].Target = d;
regenCount++;
}
else {
// Object was obtained with the weak reference.
Console.WriteLine("Regenerate object at {0}: No", index);
}
return d;
}
}
}
// This class creates byte arrays to simulate data.
public class Data
{
private byte[] _data;
private string _name;
public Data(int size)
{
_data = new byte[size * 1024];
_name = size.ToString();
}
// Simple property.
public string Name
{
get { return _name; }
}
}
// Example of the last lines of the output:
//
// ...
// Regenerate object at 36: Yes
// Regenerate object at 8: Yes
// Regenerate object at 21: Yes
// Regenerate object at 4: Yes
// Regenerate object at 38: No
// Regenerate object at 7: Yes
// Regenerate object at 2: Yes
// Regenerate object at 43: Yes
// Regenerate object at 38: No
// Cache size: 50, Regenerated: 94%