c# - Binding error on XmlDataProvider (cannot bind to non-XML object) -

-

i have problem on binding controls xml.
application populates tabcontrol @ runtime, loading xaml tab datatemplateselector:

class templateselector : datatemplateselector {   public override datatemplate selecttemplate(object item, dependencyobject container)   {     if (item != null)     {       string templatefile = string.format("templates/{0}",                                            properties.settings.default.appid + ".tmpl");       if (file.exists(templatefile))       {         filestream fs = new filestream(templatefile, filemode.open);         datatemplate template = xamlreader.load(fs) datatemplate;          tab tab = item tab;         xmldataprovider xmldataprovider = template.resources["dataprovider"] xmldataprovider;         xmldataprovider.xpath = tab.bridgeobj.xmlfilepath;          return template;       }     }     return null;   } }

the xaml:

<datatemplate     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:local="clr-namespace:eurocomcps;assembly=eurocomcps">    <datatemplate.resources>     <local:stringtoboolconverter x:key="strtoboolconverter" />     <local:stringtointconverter  x:key="strtointconverter" />     <xmldataprovider x:key="dataprovider" xpath="func/parametri/param/blocks"/>   </datatemplate.resources>    <grid>     <grid.rowdefinitions>         <rowdefinition height="auto" />         <rowdefinition height="auto" />         <rowdefinition height="auto" />         <rowdefinition height="auto" />     </grid.rowdefinitions>     <grid.columndefinitions>         <columndefinition width="100" />         <columndefinition width="auto" />     </grid.columndefinitions>      <label grid.row="0" grid.column="0" content="item 1:"/>     <label grid.row="1" grid.column="0" content="item 2:"/>     <label grid.row="2" grid.column="0" content="item 3:"/>      <textbox  name="textbox1"               grid.row="0"                grid.column="1"                text="{binding xpath='//block[@id=1]/items/item[@id=1]/@value'}" />     <checkbox grid.row="1"                grid.column="1"               ischecked="{binding xpath='//block[@id=1]/items/item[@id=2]/@value',                             converter={staticresource strtoboolconverter}}"/>      <checkbox grid.row="2"                grid.column="1"               ischecked="{binding xpath='//block[@id=1]/items/item[@id=3]/@value',                             converter={staticresource strtoboolconverter}}"/>    </grid> </datatemplate>

every page hold xmldataprovider load following xml file:

<func id="a29086">   <parametri>     <param>       <blocks max_count="2" write_id="49" read_req_id="47" read_rep_id="48" session_id="7">         <block id="1" frame="1" framelen="61">           <items max_count="14">             <item id="1" type="char" size="1" value="0" />             <item id="2" type="char" size="1" value="1" />             <item id="3" type="char" size="1" value="0" />             ...           </items>         </block>         <block id="2" frame="1" framelen="61">           <items max_count="14">             <item id="1" type="char" size="1" value="0" />             <item id="2" type="char" size="1" value="1" />             ...           </items>         </block>       </blocks>     </param>   </parametri> </func>

when running error:

system.windows.data error: 44 : bindingexpression xpath cannot bind non-xml object.; xpath='//block[@id=1]/items/item[@id=1]/@value' bindingexpression:path=/innertext; dataitem='tab' (hashcode=57706919); target element 'textbox' (name=''); target property 'text' (type 'string') tab:'eurocomcps.tab' system.windows.data error: 44 : bindingexpression xpath cannot bind non-xml object.; xpath='//block[@id=1]/items/item[@id=2]/@value' bindingexpression:path=/innertext; dataitem='tab' (hashcode=57706919); target element 'checkbox' (name=''); target property 'ischecked' (type 'nullable`1') tab:'eurocomcps.tab' system.windows.data error: 44 : bindingexpression xpath cannot bind non-xml object.; xpath='//block[@id=1]/items/item[@id=3]/@value' bindingexpression:path=/innertext; dataitem='tab' (hashcode=57706919); target element 'checkbox' (name=''); target property 'ischecked' (type 'nullable`1') tab:'eurocomcps.tab'

--- edit ---

i add datacontext controls still have problems.
the first following:

system.windows.data error: 44 : bindingexpression xpath cannot bind non-xml object.; xpath='//block[@id=1]/items/item[@id=1]/@value' bindingexpression:path=/innertext; dataitem='tab' (hashcode=46144604); target element 'textbox' (name=''); target property 'text' (type 'string') tab:'eurocomcps.tab' system.windows.data error: 44 : bindingexpression xpath cannot bind non-xml object.; xpath='//block[@id=1]/items/item[@id=1]/@value' bindingexpression:path=/innertext; dataitem='tab' (hashcode=46144604); target element 'textbox' (name='textbox1'); target property 'text' (type 'string') tab:'eurocomcps.tab'

and don't understand first 'unnamed' textbox not defined anywhere.

second that, if put converter textbox binding (eg, 1 use checkboxes) don't error.

third converter functions not called.

assuming somehow load xml xmldataprovider, don't see source defined anywhere, xpath fine don't provide source binding. should work if change this:

<textblock text="{binding source={staticresource dataprovider}, xpath='//block[@id=1]/items/item[@id=2]/@value'}"/>

if won't specify source default in datacontext.


Comments

Post a Comment

Popular posts from this blog

java - activate/deactivate sonar maven plugin by profile? -

-
i use sonar plugin executes if activated in maven profile. sonar runs on every compile. the problem build fail other team members not have sonar application installed locally. pom.xml checked in team members same copy including sonar configuration, don't want them modify purpose of disabling sonar (they might inadvertently check modified copy in). please advise how configure maven (.m2/settings.xml) and/or pom.xml sonar feature can enabled/disabled local profile. here sonar configuration in each project's pom.xml: <plugin> <groupid>org.codehaus.mojo</groupid> <artifactid>sonar-maven-plugin</artifactid> <version>1.0</version> <executions> <execution> <id>make-sonar</id> <phase>compile</phase> <goals> <goal>sonar</goal> </goals> </execution> </executions> ...
Read more

python - TypeError: can only concatenate tuple (not "float") to tuple -

-
i'm new python, question might easy, anyway, patience: as trying call newton-raphson method calculate implied volatility in black-scholes formula call/put option pricing, first thing is, newton method in scipy.optimize seems calculate function's zeros, in black-scholes formula, want function's value option price, not zero. (i'm new here programming, i'm not sure techniques.) should write function things like: def f(sigma, price): return bsformula(s0,k,r,t,q,sigma) - price then, while calling newton method, takes args=() 1 parameter in function, write this: value = newton(bsprice2, 0.5, args=price) but error message: file "bs.py", line 36, in bsimpvol value = newton(bsprice2, 0.5, args=float(price)) file "/usr/lib/python2.7/dist-packages/scipy/optimize/zeros.py", line 143, in newton q0 = func(*((p0,) + args)) typeerror: can concatenate tuple (not "float") tuple could tell me why that? how fix it? apprecia...
Read more

java - What is the difference between String. and String.this. ? -

-
this question has answer here: meaning of .this , .class in java 2 answers i'll straight point. im still learning bit of syntax , want know difference between code is code a: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.valueof(i))); } } please ignore fact i undeclared, not lost. code b: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.this.charat(i))); } } what don't yet understand difference in typing string.this , string. i under assumption when use dot operator on class accessing it's static methods(and/or variables if they're not hidden). i have studied little bit , have concluded when using string. accessing string static methods.. when using string.this. i'm accessing methods class buttonz extendi...
Read more