将数据类型nvarchar转换为地理位置时出错

Question

我正在调用.net webservice，因为两个参数（LAT，LONG）都是地理数据类型，当我向这些参数发送浮点值时它给我错误错误将数据类型navarchar转换为geographicdatatype，如何解决这个问题，贝娄是我的代码，谢谢......

NSString *soapMessage = [NSString stringWithFormat:
                             @"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
                             "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"
                             "<soap:Body>\n"
                             "<NI_TDR_QUESTION_ANSWER_DEPT xmlns=\"http://tempuri.org/\">\n"
                             "<StrEntityId>%@</StrEntityId>\n"
                             "<StrDeptId>%@</StrDeptId>\n"
                             "<StrStage>%@</StrStage>\n"
                             "<StrInwardNo>%@</StrInwardNo>\n"
                             "<StrMode>%@</StrMode>\n"
                             "</NI_TDR_QUESTION_ANSWER_DEPT>\n"
                             "</soap:Body>\n"
                             "</soap:Envelope>\n",StrEntityId,StrDeptId,stageSelected,StrInwardNo,StrMode];
    NSLog(@"%@",soapMessage);

    NSURL *url = [NSURL URLWithString:@"My URL"];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
    NSString *msgLength = [NSString stringWithFormat:@"%ld", [soapMessage length]];

    [theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [theRequest addValue: @"http://tempuri.org/NI_TDR_QUESTION_ANSWER_DEPT" forHTTPHeaderField:@"SOAPAction"];
    [theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
    [theRequest setHTTPMethod:@"POST"];
    [theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];

    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    if( theConnection )
    {
        webData = [[NSMutableData alloc]init] ;
    }
    else
    {
        NSLog(@"theConnection is NULL");
    }
}