C# string.Format 抛出异常

Question

我正在尝试使用 string.Format 格式化 string，但它抛出异常。

 var format = "public {0} {1} { get; {2}set; }";
        var arg0 = "long";
        var arg1 = "Ticks";

        var formatedString = string.Format(format, arg0, arg1, null);

最后一行抛出 System.FormatException 并包含以下详细信息：

    System.FormatException was unhandled
  HResult=-2146233033
  Message=Input string was not in a correct format.
  Source=mscorlib
  StackTrace:
       at System.Text.StringBuilder.AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args)
       at System.String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
       at System.String.Format(String format, Object arg0, Object arg1, Object arg2)
       at ConsoleApplication1.Program.Main(String[] args) in E:\lab\cheque\helloworldprism\ConsoleApplication1\ConsoleApplication1\Program.cs:line 11
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

Answer 1

它不喜欢 { get; {2}set; } 中的 { 和 } 你必须使用其中两个来转义大括号

var format = "public {0} {1} {{ get; {2}set; }}";

Answer 2

您需要转义您的 curly-braces，使用另一个大括号将转义它。

var format = "public {0} {1} {{ get; {2}set; }}";

C# string.Format 抛出异常

C# string.Format throws exception

c#

string

string-formatting