这是您的操作方式：
<Function Name="DistanceBetween" Aggregate="false" BuiltIn="false" NiladicFunction="false" IsComposable="false" ParameterTypeSemantics="AllowImplicitConversion" Schema="dbo">
<CommandText>
select dbo.DistanceBetween(@lat1,@long1,@lat2,@long2)
</CommandText>
<Parameter Name="Lat1" Type="real" Mode="In" />
<Parameter Name="Long1" Type="real" Mode="In" />
<Parameter Name="Lat2" Type="real" Mode="In" />
<Parameter Name="Long2" Type="real" Mode="In" />
</Function>
GeoDataEntities db = new GeoDataEntities();
var first = db.DistanceBetween(234, 2342, 424, 243).First().Value;
， IsComposable="false"不ReturnType，不要忘记添加：
<CommandText>
select dbo.DistanceBetween(@lat1,@long1,@lat2,@long2)
</CommandText>
希望能有所帮助。
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