C# XML remove more lines at once, but attribute values can change

问题

We have to write a code in C# (windows form) that loads a XML file into a richtextbox. WORKS

This is what a textfield looks like:

<Hmi.Screen.TextField Name="Text Field_1" AggregationName="ScreenItems" ID="31">
                        <ObjectList>
                          <Hmi.Screen.Property Name="Layer" AggregationName="Properties" ID="77">
                            <AttributeList>
                              <Value>0</Value>
                            </AttributeList>
                          </Hmi.Screen.Property>
                          <Hmi.Screen.Property Name="Left" AggregationName="Properties" ID="78">
                            <AttributeList>
                              <Value>264</Value>
                            </AttributeList>
                          </Hmi.Screen.Property>
                          <Hmi.Screen.Property Name="Top" AggregationName="Properties" ID="79">
                            <AttributeList>
                              <Value>48</Value>
                            </AttributeList>
                          </Hmi.Screen.Property>
                          <Hmi.Screen.Property Name="FitToLargest" AggregationName="Properties" ID="84">
                            <AttributeList>
                              <Value>false</Value>
                            </AttributeList>
                          </Hmi.Screen.Property>
                        </ObjectList>
                      </Hmi.Screen.TextField>

This is the part of it we want to delete OR set the value from false to true (your choice what's easier):

<Hmi.Screen.Property Name="FitToLargest" AggregationName="Properties" ID="84">
  <AttributeList>
    <Value>false</Value>
  </AttributeList>
</Hmi.Screen.Property>

This part of code is found in every textfield, but with a different value for the attribute ID. We want to delete it for every textfield.

We already have this:

XDocument xml = XDocument.Load(loadLocation);
        xml.Descendants().Elements("Hmi.Screen.Property")
                         .Where(e => e.Attribute("Name=").Value == "FitToLargest")
                         .Remove();
        xml.Save(loadLocation);

We found it on stackoverflow, but it gives this error:

Error   1   A local variable named 'e' cannot be declared in this scope because it would give a different meaning to 'e', which is already used in a 'parent or current' scope to denote something else C:\Users\*****\*****\*****\Projects\Converter\Converter\Form1.cs    211 37  Converter

We can remove the error by changing the e to for example eJbou (Jbou are my initials)

We hope somebody can help us by telling what the error means, or help us by give a code that does work.

回答1:

I hope you are doing this on Page_Load so check this

protected void Page_Load(object sender, EventArgs e)
    {

e contains the event data So if you are using it inside any event then you have to replace your e with something else like x say ,

XDocument xml = XDocument.Load(loadLocation);
        xml.Descendants().Elements("Hmi.Screen.Property")
                         .Where(x=> x.Attribute("Name").Value == "FitToLargest")
                         .Remove();
        xml.Save(loadLocation);

try this

   XDocument delete = XDocument.Load(@"D:\xxx\Delete.xml");
               delete.Descendants("Hmi.Screen.Property").Where(
             x => (string)x.Attribute("Name") == "FitToLargest").Remove();
            //e => e.Attribute("Name").Value == "FitToLargest").Remove();
            delete.Save(@"D:\xxxt\xxxx\Delete.xml");

回答2:

The error means that there is already a variable e declared outside the lambda expression.

回答3:

The problem I had was that it couldn't find the file when loading it. Be sure the file in in your bin -> debug. You can't just load any path somehow.

来源：https://stackoverflow.com/questions/18527262/c-sharp-xml-remove-more-lines-at-once-but-attribute-values-can-change

标签

xml

editing