C# WP7-XmlException-根级别的数据无效

我很难找出我的xml更新在IsolatedStorage上失败的原因，我想知道是否有其他人也有类似的问题

我试图通过遍历所有特定节点并逐个更新来更新文件

出于某种原因，它中途失败，然后声明数据在根级别无效，并且无效数据在文件末尾

代码如下：

我为每个练习调用Update方法：

    foreach (var exercise in program.Exercises)
    {
        UpdateExercise(program, exercise, true);
    }

它使用静态属性并调用数据源的更新方法：

    public void UpdateExercise(WorkoutProgram program, Exercise entity, bool isConversionUpdate)
    {
        ProgramDataSource.Update(program, entity, isConversionUpdate);
    }

然后调用此方法，并在以下几行循环后失败：“root=XElement.Load（XmlReader.Create（fs））；”

特别是这一行：

exerciseChangesElement.ReplaceWith(GetExerciseChanges(entity, exerciseElement, exerciseChange));

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是否在保存新版本之前删除现有文件

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如果更新的XML小于原始XML，则在编写新数据时，原始数据的结尾可能会保留下来。这将导致文件末尾出现额外字符，从而使XML无效。

是否有生成的XML的示例片段？我的错！我将添加XML文件。它应该只更新元素和属性值。然后再试一次。您可以在第一次加载时查看

fs

来检查是否存在此问题。感谢您的回复。删除然后添加（由于文件不再存在而不更新）的问题是，我需要将所有数据（包括ID）存储在内存中，然后重写Add方法。另外，当我尝试添加时，我得到一个InvalidOperationException：在上面添加的行中缺少父项。是否可以删除文档末尾的任何无效xml？不幸的是，没有“解析有效xml文档后忽略结尾的任何内容”设置。你可以自己试试。不过，你最好首先确保数据不会被破坏。干杯，马特，反正我要按规定进行重构。希望能突出这个问题。

<?xml version="1.0" encoding="utf-8"?>
<Program name="Strength Training">
  <ID>2eec20d2-a278-11df-bc86-00138f82a706</ID>
  <Duration hours="0" minutes="39" seconds="0" />
  <Description>Main workout program for general all over fitness</Description>
  <Exercises>
    <Exercise exerciseType="Aerobic">
      <ID>6E391E75-E75C-49CA-95FC-FEDF03D3ED1A</ID>
      <Name>Treadmill Run</Name>
      <Description>With a bar-bell on your back, feet shoulder width apart, back straight, knees slightly bent and in line with the feet, slowly go down and then back up. Squats develop power and strength.</Description>
      <Distance>4</Distance>
      <Duration hours="0" minutes="10" seconds="0" />
      <Measurement>Kilometres</Measurement>
      <ExerciseChanges>
        <Changes id="291C3CCA-9997-4B4E-A1D5-75129DBB2638" type="Aerobic" hours="0" minutes="10" seconds="0" distance="4" changeDate="27/11/2010" />
      </ExerciseChanges>
    </Exercise>
    <Exercise exerciseType="Anaerobic">
      <ID>2eec20c5-a278-11df-bc86-00138f82a706</ID>
      <Name>Squats</Name>
      <Description>With a bar-bell on your back, feet shoulder width apart, back straight, knees slightly bent and in line with the feet, slowly go down and then back up. Squats develop power and strength.</Description>
      <Reps>10</Reps>
      <Weight>
        <Amount>130</Amount>
        <Measurement>Kilograms</Measurement>
      </Weight>
      <Sets>1</Sets>
      <ExerciseChanges>
        <Changes id="D20A177E-BC23-49B0-99CD-1F467590A996" type="Anaerobic" amount="130" sets="1" reps="10" changeDate="27/11/2010" />
      </ExerciseChanges>
    </Exercise>
    <Exercise exerciseType="Anaerobic">
      <ID>2eec20d1-a278-11df-bc86-00138f82a706</ID>
      <Name>Abs</Name>
      <Description>With a bar-bell on your back, feet shoulder width apart, back straight, knees slightly bent and in line with the feet, slowly go down and then back up. Squats develop power and strength.</Description>
      <Reps>15</Reps>
      <Weight>
        <Amount>0</Amount>
        <Measurement>Kilograms</Measurement>
      </Weight>
      <Sets>1</Sets>
      <ExerciseChanges>
        <Changes id="FFF2FF28-607F-465E-8BAC-B4F21E568253" type="Anaerobic" amount="0" sets="1" reps="15" changeDate="27/11/2010" />
      </ExerciseChanges>
    </Exercise>
  </Exercises>
  <ProgramChanges>
    <Duration id="0BA96209-CF3C-4E85-8EB5-3BEE6A2DB118" hours="0" minutes="45" seconds="0" changeDate="27/11/2010" />
    <Duration id="DAEEE9DF-A155-48AC-A5CE-09D738947C76" hours="0" minutes="39" seconds="0" changeDate="28/11/2010" />
  </ProgramChanges>
</Program>

    private static XElement GetExerciseElement(Exercise entity)
    {
        var exerciseElement = new XElement("Exercise");

        if (entity is AnaerobicExercise)
        {
            var anaerobicExercise = entity as AnaerobicExercise;
            var exerciseTypeAttribute = new XAttribute("exerciseType", "Anaerobic");
            var amountElement = new XElement("Amount", anaerobicExercise.Weight.Amount);
            var measurementElement = new XElement("Measurement", anaerobicExercise.Weight.Measurement);
            var weightElement = new XElement("Weight");
            var nameElement = new XElement("Name", anaerobicExercise.Name);
            var descriptionElement = new XElement("Description", anaerobicExercise.Description);
            var repsElement = new XElement("Reps", anaerobicExercise.Repetitions);
            var setsElement = new XElement("Sets", anaerobicExercise.Sets);
            var idElement = new XElement("ID", anaerobicExercise.ID);
            var exerciseChangesElement = new XElement("ExerciseChanges");
            weightElement.Add(amountElement, measurementElement);
            var exerciseChange = new AnaerobicExerciseChange
                                     {
                                         ChangeDate = entity.ChangeDate,
                                         Amount = anaerobicExercise.Weight.Amount,
                                         Sets = anaerobicExercise.Sets,
                                         Repetitions = anaerobicExercise.Repetitions
                                     };
            entity.Changes.Add(exerciseChange);
            exerciseElement.Add(exerciseTypeAttribute, idElement, nameElement, descriptionElement, repsElement, weightElement, setsElement);
            exerciseChangesElement.ReplaceWith(GetExerciseChanges(entity, exerciseElement, exerciseChange));
            exerciseElement.Add(exerciseChangesElement);
        }

exerciseChangesElement.ReplaceWith(GetExerciseChanges(entity, exerciseElement, exerciseChange));