看看我的这个修改xml语句哪错了
xml文档文件为rdlc文件
<?xml version="1.0" encoding="utf-8"?><Report xmlns="http://schemas.microsoft.com/sqlserver/reporting/2005/01/reportdefinition" xmlns:rd="http://schemas.microsoft.com/SQLServer/reporting/reportdesigner"> <DataSources> <DataSource Name="MESDATEConnectionString"> <rd:DataSourceID>8c23ce1a-60cc-4401-b6e8-5abf69dd5c76</rd:DataSourceID> <ConnectionProperties> <DataProvider>SQL</DataProvider> <ConnectString /> </ConnectionProperties> </DataSource> </DataSources> <InteractiveHeight>29.7cm</InteractiveHeight> <rd:DrawGrid>true</rd:DrawGrid> <InteractiveWidth>21cm</InteractiveWidth> <rd:GridSpacing>0.25cm</rd:GridSpacing> <rd:SnapToGrid>true</rd:SnapToGrid> <RightMargin>2.5cm</RightMargin> <LeftMargin>2.5cm</LeftMargin> <BottomMargin>2.5cm</BottomMargin> <rd:ReportID>bad1fda3-7911-4f65-9a69-8a153762288f</rd:ReportID> <PageWidth>21cm</PageWidth> <DataSets> <DataSet Name="reportset1_bijiaojiqiselect"> <Fields> <Field Name="bianhaoid"> <DataField>bianhaoid</DataField> <rd:TypeName>System.Int32</rd:TypeName> </Field> <Field Name="datatype"> <DataField>datatype</DataField> <rd:TypeName>System.Double</rd:TypeName> </Field> </Fields> <Query> <DataSourceName>MESDATEConnectionString</DataSourceName> <CommandType>StoredProcedure</CommandType> <CommandText>dbo.bijiaojiqiselect</CommandText> <rd:UseGenericDesigner>true</rd:UseGenericDesigner> </Query> <rd:DataSetInfo> <rd:DataSetName>reportset1</rd:DataSetName> <rd:TableName>bijiaojiqiselect</rd:TableName> <rd:TableAdapterName>bijiaojiqiselectTableAdapter</rd:TableAdapterName> <rd:TableAdapterFillMethod>Fill</rd:TableAdapterFillMethod> <rd:TableAdapterGetDataMethod>GetData</rd:TableAdapterGetDataMethod> </rd:DataSetInfo> </DataSet> </DataSets> <Width>18.5cm</Width> <Body> <ColumnSpacing>1cm</ColumnSpacing> <ReportItems> <Textbox Name="x_note"> <Top>1.5cm</Top> <Width>0.75cm</Width> <Style> <FontFamily>宋体</FontFamily> <PaddingLeft>2pt</PaddingLeft> <PaddingRight>2pt</PaddingRight> <PaddingTop>2pt</PaddingTop> <PaddingBottom>2pt</PaddingBottom> </Style> <ZIndex>1</ZIndex> <CanGrow>true</CanGrow> <Left>0.5cm</Left> <Height>3.75661cm</Height> <Value>数据类型 ``</Value> </Textbox> <Chart Name="chart1"> <Legend> <Style> <BorderStyle> <Default>Solid</Default> </BorderStyle> </Style> <Position>RightCenter</Position> </Legend> <CategoryAxis> <Axis> <Title> <Caption>机器</Caption> </Title> <MajorGridLines> <Style> <BorderStyle> <Default>Solid</Default> </BorderStyle> </Style> </MajorGridLines> <MinorGridLines> <Style> <BorderStyle> <Default>Solid</Default> </BorderStyle> </Style> </MinorGridLines> <MajorTickMarks>Outside</MajorTickMarks> <Min>0</Min> <Visible>true</Visible> </Axis> </CategoryAxis> <DataSetName>reportset1_bijiaojiqiselect</DataSetName> <PlotArea> <Style> <BackgroundColor>LightGrey</BackgroundColor> <BorderStyle> <Default>Solid</Default> </BorderStyle> </Style> </PlotArea> <ThreeDProperties> <Rotation>30</Rotation> <Inclination>30</Inclination> <Shading>Simple</Shading> <WallThickness>50</WallThickness> </ThreeDProperties> <PointWidth>0</PointWidth> <Subtype>Plain</Subtype> <ValueAxis> <Axis> <Title /> <MajorGridLines> <ShowGridLines>true</ShowGridLines> <Style> <BorderStyle> <Default>Solid</Default> </BorderStyle> </Style> </MajorGridLines> <MinorGridLines> <Style> <BorderStyle> <Default>Solid</Default> </BorderStyle> </Style> </MinorGridLines> <MajorTickMarks>Outside</MajorTickMarks> <Min>0</Min> <Margin>true</Margin> <Visible>true</Visible> <Scalar>true</Scalar> </Axis> </ValueAxis> <Type>Column</Type> <Width>14cm</Width> <CategoryGroupings> <CategoryGrouping> <DynamicCategories> <Grouping Name="chart1_CategoryGroup1"> <GroupExpressions> <GroupExpression>=Fields!bianhaoid.Value</GroupExpression> </GroupExpressions> </Grouping> <Label>=Fields!bianhaoid.Value</Label> </DynamicCategories> </CategoryGrouping> </CategoryGroupings> <Palette>Default</Palette> <ChartData> <ChartSeries> <DataPoints> <DataPoint> <DataValues> <DataValue> <Value>=(Sum(Fields!datatype.Value)* 100 \ 1) / 100</Value> </DataValue> </DataValues> <DataLabel> <Visible>true</Visible> </DataLabel> <Marker> <Size>6pt</Size> </Marker> </DataPoint> </DataPoints> </ChartSeries> </ChartData> <Style> <BackgroundColor>White</BackgroundColor> <FontFamily>宋体</FontFamily> </Style> <Title> <Caption>各机器生产数据对比图</Caption> </Title> <Height>7.61905cm</Height> <Left>2cm</Left> </Chart> </ReportItems> <Height>8.25cm</Height> </Body> <Language>zh-CN</Language> <TopMargin>2.5cm</TopMargin> <PageHeight>29.7cm</PageHeight></Report>
string x_note = DropDownList1.Text; string time_ofdate = this.TextBox1.Text + "至" + this.TextBox2.Text; string xmlpath = Server.MapPath("bijiaojiqi.rdlc"); XmlDocument xmldoc = new XmlDocument(); if (File.Exists(xmlpath)) { xmldoc.Load(xmlpath); //下面这句报错：未将对象引用设置到对象的实例 xmldoc.SelectSingleNode("/Report/Body/ReportItems/Textbox[@Name='x_note']/Value").InnerText = "数据类型 ``" + x_note; xmldoc.Save("bijiaojiqi.rdlc"); }