Question

我正在尝试使用Powershell调用名称空间Newtonsoft.Json来处理大型Json文件。每个文件都包含数百万个JSON记录，但并非所有记录都是正确的格式。我正在使用Newtonsoft.Json.JsonTextReader，因为它每次都会读取一个json记录，而不是将整个文件读入内存。但是，当它读取包含某种格式问题的记录时，它将失败，并且我不知道如何忽略当前记录。有什么方法可以让它忽略当前记录并继续下一个记录吗？

Exception calling "Deserialize" with "1" argument(s): "After parsing a value an unexpected character was encountered: ". Path 'records[46796].properties.userAgent', line 374378, position 634."
At line:6 char:13
+             $single=$analyzer.Deserialize($reader)
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : JsonReaderException

Exception calling "Read" with "0" argument(s): "After parsing a value an unexpected character was encountered: ". Path 'records[46796].properties.userAgent', line 374378, position 634."
At line:1 char:7
+ while($reader.read()){
+       ~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : JsonReaderException

以下是遇到格式问题时的例外情况：

{
    "Record":
        [
            {
                "P1":"data",
                "P2":"data",
                "P3":"data"
            }
            ,
            {
                "P1":"data2",
                "P2":"data2",
                "P3":"data2"
            }
            ,
            {
                "P1":"data3",
                "P2":"data3"",
                "P3":"data3"
            }
            ,
            {
                "P1":"data4",
                "P2":"data4",
                "P3":"data4"
            }
        ]

}

这是一个示例json文件，如您所见，第三条记录的属性“ P2”存在格式问题。

function Foo(name, age){
  this.name = name;
  this.age = age;
  this.announce = function(){
    alert(this.name + " is " + this.age + " years old");
  };
}

var myFoo = new Foo("John", 42);

Answer 1

Try Catch语句怎么样？

     try {
 $single=$analyzer.Deserialize($reader)

        # Deal with the json record...
        $i++ }

 catch {
LogWrite ("Caught the exception")
LogWrite ($Error[0].Exception)
$i++
  }
}

如何让JsonTextReader忽略当前记录并继续下一个记录？

1 个答案: