无法将三元数的c＃中的short变量赋给0

Question

我正在尝试为条件中的短变量赋0，它会引发编译时错误

  

无法将类型'int'隐式转换为'short'。一个明确的   转换存在（您是否缺少演员表？）

请参阅下面的屏幕截图。 salesLineInput.Discount是[FunctionName("GetKeys")] public static async System.Threading.Tasks.Task<HttpResponseMessage> RunAsync([HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]HttpRequest req, TraceWriter log, ExecutionContext context) { //get the publishing profile information from function argument var queryStrings=req.GetQueryParameterDictionary(); string publishingUserName = ""; string publishingPassword = ""; string hostKey = ""; queryStrings.TryGetValue("publishingUserName", out publishingUserName); queryStrings.TryGetValue("publishingPassword", out publishingPassword); //get the JWT token to call the KUDU Api var base64Auth = Convert.ToBase64String(Encoding.Default.GetBytes($"{publishingUserName}:{publishingPassword}")); var apiUrl = new Uri($"https://{Environment.GetEnvironmentVariable("WEBSITE_CONTENTSHARE")}.scm.azurewebsites.net/api"); string JWT; using (var client = new HttpClient()) { client.DefaultRequestHeaders.Add("Authorization", $"Basic {base64Auth}"); var result = client.GetAsync($"{apiUrl}/functions/admin/token").Result; JWT = result.Content.ReadAsStringAsync().Result.Trim('"'); //get JWT for call funtion key } //get the key from KUDU var siteUrl = new Uri($"https://{Environment.GetEnvironmentVariable("WEBSITE_CONTENTSHARE")}.azurewebsites.net"); using (var client = new HttpClient()) { client.DefaultRequestHeaders.Add("Authorization", "Bearer " + JWT); string jsonResult = client.GetAsync($"{siteUrl}/admin/host/keys").Result.Content.ReadAsStringAsync().Result; dynamic resObject = JsonConvert.DeserializeObject(jsonResult); hostKey = resObject.keys[0].value; } var template = @"{'$schema': 'https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#', 'contentVersion': '1.0.0.0', 'parameters': {}, 'variables': {}, 'resources': [], 'outputs': { 'HostKey':{ 'value': {hostKey}, 'type' : 'string' } } }"; HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK); response.Content = new StringContent(template, System.Text.Encoding.UTF8, "application/json"); return response; } ，而SalesLineEntity.Discount是short：

这是我尝试的其他一些代码（与屏幕截图中的代码不同）：

Nullable<double>

为什么 if(SalesLineEntity.Discount.HasValue) salesLineInput.Discount = (short)(SalesLineEntity.Discount * 100); else salesLineInput.Discount = 0; 起作用，但是三进制不起作用？

Answer 1

投射整个声明到short

 salesLineItem.Discount = (short)(condition ? somecalc : 0);

或

 salesLineItem.Discount = condition ? somecalc : (short)0;