async void dp_DrawCompleted(object sender, DrawEventArgs e)
{
if (e.Geometry == null)
{
return;
}
GetFeaturesByBufferParameters param = new GetFeaturesByBufferParameters
{
DatasetNames = new List<string> { "World:Countries" },
BufferDistance = 10,
Geometry = e.Geometry,
};
//与服务器交互
try
{
GetFeaturesByBufferService ser = new GetFeaturesByBufferService(url);
var result = await ser.ProcessAsync(param);
if (result != null)
{
featureslayer.AddFeatureSet(result.Features);
}
}
//与服务器交互失败
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private Dictionary<string, string> GetParameters(GetFeaturesByBufferParameters parameters)
{
Dictionary<string, string> dictionary = new Dictionary<string, string>();
if (string.IsNullOrEmpty(parameters.AttributeFilter))
{
dictionary.Add("getFeatureMode", "\"BUFFER\"");
}
else
{
dictionary.Add("getFeatureMode", "\"BUFFER_ATTRIBUTEFILTER\"");
dictionary.Add("attributeFilter", parameters.AttributeFilter);
}
if (parameters.DatasetNames != null && parameters.DatasetNames.Count > 0)
{
string jsonDatasetNames = "[";
List<string> list = new List<string>();
for (int i = 0; i < parameters.DatasetNames.Count; i++)
{
list.Add(string.Format("\"{0}\"", parameters.DatasetNames[i]));
}
jsonDatasetNames += string.Join(",", list.ToArray());
jsonDatasetNames += "]";
dictionary.Add("datasetNames", jsonDatasetNames);
}
if (parameters.Geometry != null)
{
dictionary.Add("geometry", ServerGeometry.ToJson(Bridge.ToServerGeometry(parameters.Geometry)));
}
else
{
throw new ArgumentNullException(ExceptionStrings.ArgumentIsNull);
}
dictionary.Add("bufferDistance", parameters.BufferDistance.ToString());
if (parameters.Fields != null && parameters.Fields.Count > 0)
{
FilterParameter fp = new FilterParameter();
fp.Fields = parameters.Fields;
dictionary.Add("queryParameter", FilterParameter.ToJson(fp));
}
return dictionary;
}
/// <summary>${REST_GetFeaturesByBufferService_method_ProcessAsync_D}</summary>
/// <param name="parameters">${REST_GetFeaturesByBufferService_method_ProcessAsync_param_Parameters}</param>
/// <param name="state">${REST_GetFeaturesByBufferService_method_ProcessAsync_param_state}</param>
public async Task<GetFeaturesResult> ProcessAsync(GetFeaturesByBufferParameters parameters)
{
if (parameters == null)
{
throw new ArgumentNullException(ExceptionStrings.ArgumentIsNull);
}
if (string.IsNullOrEmpty(this.Url))
{
throw new InvalidOperationException(ExceptionStrings.InvalidUrl);
}
//base.Url += ".json?returnContent=true";
base.Url += string.Format(".json?returnContent=true&debug=true&fromIndex={0}&toIndex={1}", parameters.FromIndex, parameters.ToIndex);
var result = await base.SubmitRequest(base.Url, GetParameters(parameters), true);
JsonObject jsonObject = JsonObject.Parse(result);
return GetFeaturesResult.FromJson(jsonObject);
}
