小编Fai*_*air的帖子

在 .NET5 之前，我们通过以下代码序列化/反序列化字节/对象：

    private static byte[] StructToBytes<T>(T t)
    {
        using (var ms = new MemoryStream())
        {
            var bf = new BinaryFormatter();
            bf.Serialize(ms, t);
            return ms.ToArray();
        }
    }

    private static T BytesToStruct<T>(byte[] bytes)
    {
        using (var memStream = new MemoryStream())
        {
            var binForm = new BinaryFormatter();
            memStream.Write(bytes, 0, bytes.Length);
            memStream.Seek(0, SeekOrigin.Begin);
            var obj = binForm.Deserialize(memStream);
            return (T)obj;
        }
    }

但出于安全原因，BinaryFormatter 将被删除：

https://docs.microsoft.com/zh-cn/dotnet/standard/serialization/binaryformatter-security-guide

那么有没有一些简单但高性能的方法来代替 BinaryFormatter 呢？

1. 使用Visual Studio创建了一个MVC5 WebAPI2项目
2. 创建了一个基本的JSON POST
3. Post参数导致HttpRequestBase.GetBufferedInputStream未找到失败

适用于:

1. Windows与视觉工作室

失败:

1. OSX Xamarin
2. Gentoo Xamarin

测试应用程序:Mono MVC5 Web API2测试用例

测试程序:

1. 在xamarin中运行MVC应用程序
2. 在加载时,页面将向服务器发送ajax帖子.

3. a)服务器将在失败时返回500错误

   b)console.log成功发布arg

   Error: {
       "Message": "An error has occurred.",
       "ExceptionMessage": "Method 'HttpRequestBase.GetBufferedInputStream' not found.",
       "ExceptionType": "System.MissingMethodException",
       "StackTrace": " at System.Web.Http.WebHost.HttpControllerHandler+LazyStreamContent.get_StreamContent () [0x00008] in :0
   
                       at System.Web.Http.WebHost.HttpControllerHandler+LazyStreamContent.CreateContentReadStreamAsync () [0x00000] in :0
   
                       at System.Net.Http.HttpContent+c__async2.MoveNext () [0x00095] in /private/tmp/source-mono-mac-4.0.0-branch-c5sr4/bockbuild-mono-4.0.0-branch/profiles/mono-mac-xamarin/build-root/mono-4.0.4/mcs/class/System.Net.Http/System.Net.Http/HttpContent.cs:159
   
                       --- End of stack trace from previous location where exception was thrown ---
   
                       at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000b] in /private/tmp/source-mono-mac-4.0.0-branch-c5sr4/bockbuild-mono-4.0.0-branch/profiles/mono-mac-xamarin/build-root/mono-4.0.4/mcs/class/corlib/System.Runtime.ExceptionServices/ExceptionDispatchInfo.cs:61
   
                       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) …

   Run Code Online (Sandbox Code Playgroud)

我使用的是EF Core 3.1 + MySQL，并使用这种方法进行查询：

IQueryable<ApplicationUser> customers = from u in _context.Users where (u.Customer != null && u.IsActive) select u;
if (!String.IsNullOrEmpty(searchString))
{
customers = customers.Where(s => s.Email.Contains(searchString));
}

我升级为使用 EF.Function.Like 以获得更好的性能：

if (!String.IsNullOrEmpty(searchString))
{
customers = customers.Where(x => EF.Functions.Like(x.Email, $"%{searchString}%"));
}

但它是区分大小写的，如何使其不区分大小写呢？