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if语句中应有分号

.net c#

CactusCake · 技术社区 · 7 月前

我从另一个在线问答中借用了一些代码(被接受为有效的解决方案),但我的编译器似乎希望有一些额外的字符,我不明白为什么。

编译器期待所有这些:

Line: 37 - ) expected
Line: 37 - ; expected
Line: 37 - Invalid expression term ')'
Line: 37 - ; expected

在线路上:

if (ex is Avalara.AvaTax.RestClient.AvaTaxError avaTaxError)

在下面的代码块中

using System;
using SAPbobsCOM;
using SAPbouiCOM;
using Avalara.AvaTax.RestClient;
namespace B1UPCODE 
{ 
    public class B1UPCLASS 
    { 
        public void DynamicCode(params object[] parameters) 
        { 
            SAPbobsCOM.Company company = (SAPbobsCOM.Company)parameters[0];
            SAPbouiCOM.Application application = (SAPbouiCOM.Application)parameters[1];
            SAPbouiCOM.Form form = (SAPbouiCOM.Form)parameters[2];
            SBO.UI.B1Form eventForm = (SBO.UI.B1Form)parameters[3];
            UniversalFunctions.Model.CommonEventObject eventData = (UniversalFunctions.Model.CommonEventObject)parameters[4];
            SBO.AddonLogic.AddonData addonData = (SBO.AddonLogic.AddonData)parameters[5];
            var Client =    new AvaTaxClient("Whatever I want to call the client", "1.0", Environment.MachineName, AvaTaxEnvironment.Production)
                            .WithSecurity("MyUsername", "MyPassword");
                 
            // Verify that we can ping successfully
            var pingResult = Client.Ping();
            if ((bool)pingResult.authenticated)
            {
                application.StatusBar.SetText("Ping success", SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Success);

                try
                {
                    // Create a simple transaction for $100 using the fluent transaction builder
                    var transaction = new TransactionBuilder(Client, "DEFAULT", DocumentType.SalesInvoice, "9999")
                    .WithAddress(TransactionAddressType.SingleLocation, "255 S King St", null, null, "Seattle", "WA", "98104", "US")
                    .WithLineItem(100.0m, 1, "P0000000")
                    .Create();
                }
                catch(Exception ex)
                {

                    if (ex is Avalara.AvaTax.RestClient.AvaTaxError avaTaxError)
                    {
                        // Print the error status code (e.g. "BadRequest", "Unauthorized", etc.)
                        application.StatusBar.SetText("AvaTax Error Type: " + avaTaxError.statusCode, SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Error);
                        // Print the error message returned by AvaTax
                        application.StatusBar.SetText("AvaTax Error Message: " + avaTaxError.error.error.message.ToString(), SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Error);

                        // Print the error details for each error encountered
                        application.StatusBar.SetText("AvaTax Error Details:", SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Error);

                        foreach (var detail in avaTaxError.error.error.details)
                        {
                            // Print the description and help link for each error
                            application.StatusBar.SetText(" Description: " + detail.description, SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Error);
                            application.StatusBar.SetText(" Help Link: " + detail.helpLink, SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Error);
                        }

                        // Print the full error response received from AvaTax
                        application.StatusBar.SetText("Full Error Response: " + avaTaxError.error.error.ToString(), SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Error);

                    }
                }
            }
            else
            {
            application.StatusBar.SetText("Ping fail", SAPbouiCOM.BoMessageTime.bmt_Short, SAPbouiCOM.BoStatusBarMessageType.smt_Error);
            }
        } 
    } 
}

我尝试从if()比较中取出avaTaxError赋值,并在该块内创建一个变量——这让我只剩下一个预期的分号。但我仍然不明白它要我把它放在哪里。

        if (ex is Avalara.AvaTax.RestClient.AvaTaxError)
        {
            var (Avalara.AvaTax.RestClient.AvaTaxError) avaTaxError;

2 回复 | 直到 7 月前

Jonas Høgh 7 月前

无论语言版本如何,以下代码都应该更地道,并强调您实际上打算吞下所有其他异常:

try {
  // code here
} catch (Avalara.AvaTax.RestClient.AvaTaxError avaTaxError) {
  // your if body here
}
catch (Exception) {}

Ivan Petrov 7 月前

您使用的是7.0之前的C#版本 where the pattern matching 具有 is 并介绍了任务。

您可能使用的是较旧版本的Visual Studio(2015年或更早版本),因为2017+开箱即用。

如果你(不太可能)在VS 2017+上,看看 LangVersion 财产在 csproj 并将其设置为7.0(或尝试删除它,因为这样它将默认为7.3-最新官方支持的.NET Framework C#版本)

如果您使用的是VS2015及更早版本:

if (ex is Avalara.AvaTax.RestClient.AvaTaxError)
    var avaTaxError = ex as Avalara.AvaTax.RestClient.AvaTaxError;