在Blazor应用程序中,使用动态延迟加载(Dynamic Lazy Loading)是一种优化技术,可以提高性能和资源利用。动态延迟加载是指按需加载组件、页面或模块,而不是在应用程序启动时加载所有内容。
实现动态延迟加载的方法是使用加载器(Loader),该加载器可根据需要从服务器加载组件或模块。以下是一种实现动态延迟加载的示例:
首先,在应用程序中创建一个自定义加载器:
public class ComponentLoader { private readonly HttpClient httpClient;
public ComponentLoader(HttpClient httpClient)
{
this.httpClient = httpClient;
}
public async Task LoadComponentAsync(string uri) where TComponent : IComponent
{
var assembly = await httpClient.GetStreamAsync(uri);
var assemblyBytes = await new MemoryStream(ReadToEnd(assembly)).ToArrayAsync();
var assemblyName = AssemblyLoadContext.GetAssemblyName(assemblyBytes);
var assemblyReference = MetadataReference.CreateFromStream(new MemoryStream(assemblyBytes));
var componentType = (await new CSharpCompilation().AddReferences(assemblyReference).AddSyntaxTrees(
CSharpSyntaxTree.ParseText(await httpClient.GetStringAsync(uri.Replace(".dll", ".razor.cs"))))
.GetAssemblyAsync()).GetType(uri.Split('/').Last().Replace(".dll", ""));
return (TComponent)Activator.CreateInstance(componentType);
}
private static byte[] ReadToEnd(Stream stream)
{
long originalPosition = 0;
if (stream.CanSeek)
{
originalPosition = stream.Position;
stream.Position = 0;
}
try
{
byte[] readBuffer = new byte[4096];
int totalBytesRead = 0;
int bytesRead;
while ((bytesRead = stream.Read(readBuffer, totalBytesRead, readBuffer.Length - totalBytesRead)) > 0)
{
totalBytesRead += bytesRead;
if (totalBytesRead == readBuffer.Length)
{
int nextByte = stream.ReadByte();
if (nextByte != -1)
{
byte[] temp = new byte[readBuffer.Length * 2];
Buffer.BlockCopy(readBuffer, 0, temp, 0, readBuffer.Length);
Buffer.SetByte(temp, totalBytesRead, (byte)nextByte);
readBuffer = temp;
totalBytesRead++;
}
}
}
byte[] buffer = readBuffer;
if (readBuffer.Length != totalBytesRead)
{
buffer = new byte[totalBytesRead];
Buffer.BlockCopy
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