Android没有这个问题，但是当我在iOS中运行相同的工作代码时，我得到了异常
public async Task Login(string inlogData, string password, string gcm)
{
Login login = new Dharma.Login ();
login.inlog_data = inlogData;
login.password = password;
login.phone_token = gcm;
HttpClient client = new HttpClient ();
HttpResponseMessage response = null;
string json = JsonConvert.SerializeObject(login, Formatting.Indented);
client.Timeout = TimeSpan.FromMilliseconds (10000);
client.BaseAddress = new Uri (ConstantVariabels.GetLoginUrl());
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var content = new StringContent (json, Encoding.UTF8, "application/json");
try
{
response = await client.PostAsync (client.BaseAddress, content);
response.EnsureSuccessStatusCode ();
var JsonResult = response.Content.ReadAsStringAsync ().Result;
dynamic dynJson = JsonConvert.DeserializeObject(JsonResult);
string token = dynJson ["api_token"]; //THIS LINE THROWS THE EXCEPTION
LoginPageViewModel.LoginSucceeded(token, true);
}
catch(TaskCanceledException te)
{
LoginPageViewModel.LoginSucceeded(te.Message.ToString(), false);
}
catch(HttpRequestException hre)
{
LoginPageViewModel.LoginSucceeded(hre.Message.ToString(), false);
}
catch(Exception e)
{
LoginPageViewModel.LoginSucceeded("fail", false);
}
}
消息：ref类型的解释器
堆栈跟踪：
at Microsoft.Scripting.Interpreter.LightCompiler.CompileMethodCallExpression (System.Linq.Expressions.Expression expr) [0x00089] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1283
at Microsoft.Scripting.Interpreter.LightCompiler.CompileNoLabelPush (System.Linq.Expressions.Expression expr) [0x001ba] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1642
at Microsoft.Scripting.Interpreter.LightCompiler.Compile (System.Linq.Expressions.Expression expr) [0x00008] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1729
at Microsoft.Scripting.Interpreter.LightCompiler.CompileConditionalExpression (System.Linq.Expressions.Expression expr, Boolean asVoid) [0x00007] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:818
at Microsoft.Scripting.Interpreter.LightCompiler.CompileNoLabelPush (System.Linq.Expressions.Expression expr) [0x001d2] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1644
at Microsoft.Scripting.Interpreter.LightCompiler.Compile (System.Linq.Expressions.Expression expr) [0x00008] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1729
at Microsoft.Scripting.Interpreter.LightCompiler.Compile (System.Linq.Expressions.Expression expr, Boolean asVoid) [0x00012] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1593
at Microsoft.Scripting.Interpreter.LightCompiler.CompileBlockExpression (System.Linq.Expressions.Expression expr, Boolean asVoid) [0x00028] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:379
at Microsoft.Scripting.Interpreter.LightCompiler.CompileNoLabelPush (System.Linq.Expressions.Expression expr) [0x003d0] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1683
at Microsoft.Scripting.Interpreter.LightCompiler.Compile (System.Linq.Expressions.Expression expr) [0x00008] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1729
at Microsoft.Scripting.Interpreter.LightCompiler.CompileGotoExpression (System.Linq.Expressions.Expression expr) [0x0001f] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:955
at Microsoft.Scripting.Interpreter.LightCompiler.CompileNoLabelPush (System.Linq.Expressions.Expression expr) [0x0042d] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1689
at Microsoft.Scripting.Interpreter.LightCompiler.CompileAsVoid (System.Linq.Expressions.Expression expr) [0x00085] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1620
at Microsoft.Scripting.Interpreter.LightCompiler.Compile (System.Linq.Expressions.Expression expr, Boolean asVoid) [0x00006] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1591
at Microsoft.Scripting.Interpreter.LightCompiler.CompileConditionalExpression (System.Linq.Expressions.Expression expr, Boolean asVoid) [0x00071] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:828
at Microsoft.Scripting.Interpreter.LightCompiler.CompileNoLabelPush (System.Linq.Expressions.Expression expr) [0x001d2] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1644
at Microsoft.Scripting.Interpreter.LightCompiler.CompileAsVoid (System.Linq.Expressions.Expression expr) [0x00085] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1620
at Microsoft.Scripting.Interpreter.LightCompiler.CompileBlockStart (System.Linq.Expressions.BlockExpression node) [0x000b0] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:405
at Microsoft.Scripting.Interpreter.LightCompiler.CompileBlockExpression (System.Linq.Expressions.Expression expr, Boolean asVoid) [0x00007] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:376
at Microsoft.Scripting.Interpreter.LightCompiler.CompileNoLabelPush (System.Linq.Expressions.Expression expr) [0x003d0] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1683
at Microsoft.Scripting.Interpreter.LightCompiler.Compile (System.Linq.Expressions.Expression expr) [0x00008] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:1729
at Microsoft.Scripting.Interpreter.LightCompiler.CompileTop (System.Linq.Expressions.LambdaExpression node) [0x00055] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Interpreter/LightCompiler.cs:221
at Microsoft.Scripting.Generation.CompilerHelpers.LightCompile (System.Linq.Expressions.LambdaExpression lambda) [0x00000] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Dynamic/Generation/CompilerHelpers.cs:619
at System.Linq.Expressions.Compiler.LambdaCompiler.Compile (System.Linq.Expressions.LambdaExpression lambda, System.Runtime.CompilerServices.DebugInfoGenerator debugInfoGenerator) [0x00000] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/System.Core/System.Linq.Expressions.Interpret/LambdaCompiler.cs:41
at System.Linq.Expressions.Expression`1[TDelegate].Compile () [0x00000] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Scripting.Core/Ast/LambdaExpression.cs:188
at System.Runtime.CompilerServices.CallSiteBinder.BindCore[T] (System.Runtime.CompilerServices.CallSite`1 site, System.Object[] args) [0x00059] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Scripting.Core/Actions/CallSiteBinder.cs:148
at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet] (System.Runtime.CompilerServices.CallSite site, System.Dynamic.T0 arg0) [0x0010d] in /Users/builder/data/lanes/3234/d8bedd03/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/dlr/Runtime/Microsoft.Scripting.Core/Actions/UpdateDelegates.Generated.cs:255
at Dharma.HttpRequests+<Login>c__async4.MoveNext () [0x0019e] in /Users/laurenspouders/dharmapp/Dharma/Library/HttpRequests.cs:345
答案 0 :(得分：5)
我遇到了同样的问题，发现之前使用的Newtonsoft JSON用于引用＆＃34;值＆＃34;默认情况下，但现在还没有，所以只需添加.Value
string token = dynJson ["api_token"].Value;
答案 1 :(得分：0)
问题是dynJson ["api_token"]返回类型Newtonsoft.Json.Linq.JTokenType.String，您将其分配给string。因此隐式转换不会发生并给出异常。添加一个可行的显式转换。
string token = (string)dynJson ["api_token"];
你必须在Android中得到一些关于隐式演员的错误。
答案 2 :(得分：0)
我解决了我的问题。
public async Task Login(string inlogData, string password, string gcm)
{
Login login = new Dharma.Login ();
login.inlog_data = inlogData;
login.password = password;
login.phone_token = gcm;
HttpClient client = new HttpClient ();
HttpResponseMessage response = null;
string json = JsonConvert.SerializeObject(login, Formatting.Indented);
client.Timeout = TimeSpan.FromMilliseconds (10000);
client.BaseAddress = new Uri (ConstantVariabels.GetLoginUrl());
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var content = new StringContent (json, Encoding.UTF8, "application/json");
try
{
response = await client.PostAsync (client.BaseAddress, content);
response.EnsureSuccessStatusCode ();
var JsonResult = response.Content.ReadAsStringAsync ().Result;
dynamic dynJson = JsonConvert.DeserializeObject(JsonResult);
string token = "";
foreach (var obj in dynJson)
{
if(obj.Name.Equals("api_token"))
{
token = obj.Value.ToString();
}
}
LoginPageViewModel.LoginSucceeded(token, true);
}
catch(TaskCanceledException te)
{
LoginPageViewModel.LoginSucceeded(te.Message.ToString(), false);
}
catch(HttpRequestException hre)
{
LoginPageViewModel.LoginSucceeded(hre.Message.ToString(), false);
}
catch(Exception e)
{
LoginPageViewModel.LoginSucceeded("fail", false);
}
}