Blazor服务中可以使用ConcurrentDictionary类来实现异步字典的操作。示例如下：

在服务端：

using System.Collections.Concurrent;
using System.Threading.Tasks;

public class MyService : IMyService 
{
    private ConcurrentDictionary _dictionary = new ConcurrentDictionary();

    public async Task GetValueAsync(int key)
    {
        if (_dictionary.TryGetValue(key, out string value))
        {
            return value;
        }

        return await Task.FromResult(null);
    }

    public async Task AddOrUpdateAsync(int key, string value)
    {
        _dictionary.AddOrUpdate(key, value, (k, v) => value);
        await Task.CompletedTask;
    }

    public async Task RemoveAsync(int key)
    {
        _dictionary.TryRemove(key, out string value);
        await Task.CompletedTask;
    }
}

在客户端：

@page "/"

@inject IMyService MyService

@if (_value == null)
{
    Get Value
}
else
{
    

        Value: @_value
    
}



AddOrUpdate
Remove

@code {
    private int _key;
    private string _value;
    
    private async Task GetValue()
    {
        _value = await MyService.GetValueAsync(_key);
    }
    
    private async Task AddOrUpdate()
    {
        await MyService.AddOrUpdateAsync(_key, _value);
    }
    
    private async Task Remove()
    {
        await MyService.RemoveAsync(_key);
    }
}