我使用了StartsWith，但它不能通过linq在azure cosmosDB文档中工作

我使用STARTSWITH通过linq过滤记录，从azure cosmos db获取数据。但它总是将记录计数显示为零

用于获取数据的查询：

var locs=来自数据
在不同地点
where data.Properties.Street.ToLower（）.StartsWith（“胸部”）
选择数据；

---

以下是来自文档数据库的示例：

{
    "type": "Feature",
    "geometry": {
        "type": "Point",
        "coordinates": [
            -0.141246,
            51.56292
        ]
    },
    "properties": {
        "city": "london",
        "countryCode": "GB",
        "parkingType": "permit holders only",
        "approxNoOfSpaces": 4,
        "timesOfOperation": "mon-fri 10:00-12:00",
        "maximumStay": "N/A",
        "tariff": "N/A",
        "cashlessIdentifier": "N/A",
        "nearestMachine": "N/A",
        "street": "Chester Road",
        "postcode": "N19 5DE",
        "controlledParkingZone": "CA-U",
        "validParkingPermits": "CA-U",
        "parkingBayLengthMetres": 19,
        "disclaimer": "The information provider and/ or licensor are not liable for any errors or omissions contained within this dataset and shall not be liable for any loss, injury or damage caused by its use.",
        "easting": 528937,
        "northing": 186530,
        "EPSG:27700 Well Known Text Geometry": "LINESTRING (528943.9746311313 186522.8076569282,528944.9970187079 186524.33721909559,528929.9827624428 186537.32350181084,528928.7624933998 186535.9039081653)",
        "EPSG:4326 Well Known Text Geometry": "LINESTRING (-0.14114833166779203 51.56285353559299,-0.14113302974759298 51.56286704785321,-0.14134475707247782 51.56298717904703,-0.14136287187179347 51.56297470018317)",
        "externalFeatureId": 46044821,
        "spatialAccuracy": "Defined By Custodian",
        "lastUploaded": "07/08/2019 11:01:52 PM",
        "location": "(51.56292, -0.141246)",
        "organisationURI": "http://opendatacommunities.org/id/london-borough-council/camden",
        ":@computed_region_hxwp_gyfc": 10,
        ":@computed_region_6i9a_26nj": 66
    },
    "documentType": "location",
    "id": "********************",
    "_rid": "*******************",
    "_self": "****************************",
    "_etag": "*****************************",
    "_attachments": "********************",
    "_ts": 1565344913
}

---

一旦你把“切斯特路”改成小写，它就不再以“胸部”开头，而是以“胸部”开头。你试过用“胸部”作为开始的理由吗？是的，我试过了。但它不起作用实际上，当我们将STARTSWITH与属性类型一起使用时，它起作用，但在属性上不起作用。street。。。它不适用于内部对象