c# barcode reader example LINQ to SharePoint and SPMetal in Microsoft Office

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LINQ to SharePoint and SPMetal
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Joining Tables Using LINQ
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You may have noticed in the preceding code that the Join extension method is included in the list of inefficient extension methods earlier in the chapter and as such is not permitted within LINQ to SharePoint However, this does not mean that retrieving related data isn t possible, only that arbitrary joins are not supported Where the relationship between two entities is defined by a lookup column, retrieving related data is permitted and in fact is actually achieved using a much simpler syntax than is required by the Join operator
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Simple Join
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Let s add a new button to enable us to execute a basic join query Label the button Basic Join Query and in the event handler add the following code:
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private void button8_Click(object sender, EventArgs e) { using(HireSampleDataContext dxRead = new HireSampleDataContext(SiteUrlText)) { StringBuilder sb = new StringBuilder(); using (StringWriter logWriter = new StringWriter(sb)) { //log the generated CAML query to a StringWriter dxReadLog = logWriter; dxReadObjectTrackingEnabled = false; var basicQuery = from a in dxReadOnHireAssets where aContractReferenceContractStartDateValue < DateTimeNow orderby aAssetTag, aContractReferenceContractStartDate select new { aAssetTag, aAssetId, aContractReferenceContractId, aContractReferenceContractStartDate, aContractReferenceContractEndDate }; dataGridView1DataSource = basicQueryToList();
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//create a temporary file for the generated CAML string fileName = PathCombine(PathGetTempPath(), "tmpCamlxml"); XmlDocument doc = new XmlDocument(); docLoadXml(sbToString()); docSave(fileName); //point the browser control to the temporary generated CAML file webBrowser1Navigate(fileName);
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Data Access Layer
From this code example, you can see that the join is performed by making use of the lookup field Within the LINQ query, the lookup field is of the same type as the item to which it refers In this case, the ContractReference lookup field is implemented as a property of type HireContract This allows you to deal with entity objects within a logical hierarchy, ignoring the underlying data structure implementation This is much simpler than the Join extension method syntax, which relies on your knowledge of the data structure to know which tables to join together and which fields to use for the join
Complex Join
Using this syntax, you can join multiple lists together as long as appropriate lookup fields have been defined To explore this, we ll add another button, this time labeled Complex Join Query with the following code:
private void button9_Click(object sender, EventArgs e) { using(HireSampleDataContext dxRead = new HireSampleDataContext(SiteUrlText)) { StringBuilder sb = new StringBuilder(); using (StringWriter logWriter = new StringWriter(sb)) { //log the generated CAML query to a StringWriter dxReadLog = logWriter; dxReadObjectTrackingEnabled = false; var basicQuery = from n in dxReadAssetNotes where intParse(nLocationCodeSubstring(8))==2 && nAssetReferenceContractReferenceContractStartDateValue < DateTimeNow orderby nLocationCode, nAssetReferenceAssetId, nAssetReferenceContractReferenceContractStartDate select new { nLocationCode, nAssetReferenceAssetTag, nAssetReferenceAssetId, nAssetReferenceContractReferenceContractId, nAssetReferenceContractReferenceContractStartDate, nAssetReferenceContractReferenceContractEndDate }; dataGridView1DataSource = basicQueryToList(); } //create a temporary file for the generated CAML string fileName = PathCombine(PathGetTempPath(), "tmpCamlxml"); XmlDocument doc = new XmlDocument(); docLoadXml(sbToString()); docSave(fileName);
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LINQ to SharePoint and SPMetal
//point the browser control to the temporary generated CAML file webBrowser1Navigate(fileName);
In this sample, we ve joined all three lists together and have also performed some string processing as part of the Where clause You ll notice from the generated CAML that the Location Code filter is not included in the query; that s because the LINQ provider brings back the resulting rows and then programmatically applies the additional filter in memory before returning the results Again, this can be done efficiently because only one CAML query is required, so the resource usage is minimal
Combining LINQ to SharePoint and LINQ to Objects
Although the join syntax in LINQ to SharePoint is very powerful, in some situations you won t be able to retrieve the data that you need using this syntax Some operations that you require are not permitted on the LINQ to SharePoint provider, because they are considered inefficient
Performing an In-Memory Subquery
Here s an example of an in-memory subquery: Suppose that our sample application requires a list of asset tags and locations codes for a particular contract, but only where the locations are also being used to store assets that are subject to another contract If you were writing this query using SQL, it would be relatively straightforward something along the lines of this:
SELECT AssetTag, LocationCode FROM AssetNotes as n INNER JOIN OnHireAssets as a ON AAssetId=nAssetId INNER JOIN HireContracts as c ON cContractId=aContractId WHERE nLocationCode in ( SELECT LocationCode FROM AssetNotes as n1 INNER JOIN OnHireAssets as a1 ON a1AssetId=n1AssetId INNER JOIN HireContracts as c1 On c1ContractId=a1ContractId Where c1ContractId=CONT-002' ) AND cContractId='CONT-001'
OK maybe this is not that straightforward with all the joins, but you get the picture You could use a subquery to filter the results to suit your requirements Unsurprisingly, given its similarity to SQL, LINQ syntax also supports a similar operation Let s use our sample application to try it out As usual, add a new button, label it Sub Query and add the following code:
private void button10_Click(object sender, EventArgs e) {
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