我对实体框架和Web服务还很陌生。
我尝试做是通过调用Web API中update方法从winforms应用程序更新记录Http响应消息返回错误请求，并且不更新任何内容
要么是我在api中写的更新记录的代码有逻辑错误，要么是我在winform中写的代码有逻辑错误。我不知道问题出在哪里。
更新API中的方法

[HttpPut]
public async Task <IActionResult> UpdateStatus ([FromBody]BookStatus entity)
{
    var original = Tools.Context.BookStatus. Find(1);
    Tools.Context.Entry (original).CurrentValues.SetValues (entity);
    var result = await Tools.Context.SaveChangesAsync();

    if (result > 0)
        return Ok (result);

    return Badrequest ();
}

调用更新方法的Winform应用程序

private async void button3_click (object sender,EventArgs e)
{
    BookStatus status = new BookStatus();
    status.IsAvailable = true;
    
    HttpClientHandler clientHandler = new HttpClientHandler();
    clientHandler.ServerCertificateCustomValidationCallback=(sender,cert,chain,sslPolicyError)=>{return true;};
    
    HttpClient client = new HttpClient(clientHandler);
    client.BaseAdress = new Uri ("Https://localhost:5001");
    
    var serialize = JsonConvert.SerializeObject (status);
    var content = new StringContent(serialize,Encoding.UTF8,"application/json");
    var result = await client.PutAsJsonAsync ("api/BookStatus/UpdateStatus",content);
    Message.Text = result.StatusCode.ToString ()";
}