arcgis featureclass的blob字段
图片存入SDE blob 字段 ：
private void UpdateRasterToSDE()
{
try
{
OpenFileDialog openFile = new OpenFileDialog();
DialogResult result = openFile.ShowDialog();
if (openFile.FileName == "" || openFile.FileName == null) return;
ITable pTable;
ICursor cursor;
IFeatureCursor featureCursor;
IQueryFilter filter = new QueryFilterClass();
pTable = ((IFeatureSelection)m_CurFeatureLayer).SelectionSet.Target;
IFeature feature = new FeatureClass_2();
IMemoryBlobStream pMemoryStream = new MemoryBlobStreamClass();
pMemoryStream.LoadFromFile(openFile.FileName);
bool isEditing = false;
if (m_CurFeatureLayer != null)
{
if (Form1.mapEdit.IsEditing()) isEditing = true;
IWorkspaceEdit wspEdit;
wspEdit = ((IDataset)((IFeatureSelection)m_CurFeatureLayer).SelectionSet.Target).Workspace as IWorkspaceEdit;
wspEdit.StartEditing(true);
wspEdit.StartEditOperation();
int OID = 0;
for (int i = 0; i < dataGridView2.Columns.Count; i++)
{
if (dataGridView2.Columns[i].Name == pTable.OIDFieldName)
{
OID = i;
}
}
filter.WhereClause = dataGridView2.Columns[OID].Name + " = " + dataGridView2.Rows[pRow].Cells[OID].Value.ToString();
cursor = pTable.Search(filter, true);
featureCursor = cursor as IFeatureCursor;
feature = featureCursor.NextFeature();
if (feature == null)
return;
IRow Row = (IRow)feature;//也可以不转换，直接用feature存入
Row.set_Value(pColumn, pMemoryStream);
Row.Store();
wspEdit.StopEditOperation();
wspEdit.StopEditing(true);
if (isEditing) Form1.mapEdit.StartEdit();
}
}
catch
{
MessageBox.Show("图片数据过大，请加入小于1M的图片！");//或者是其他问题，不详述
}
DataGridViewTextBoxCell textboxcell = (DataGridViewTextBoxCell)dataGridView2.Rows[pRow].Cells[pColumn];
textboxcell.Value = "有";
}
图片读出：
private void ViewToolStripMenuItem_Click(object sender, EventArgs e)
{
Viewer viewer=new Viewer();
Image image;
IMemoryBlobStreamVariant pMemoryStream = new MemoryBlobStreamClass();
int row=0;
IFeatureCursor feaCursor=m_CurFeatureLayer.Search(null,true);
IFeature feature=feaCursor.NextFeature();
for (int i = 0; i < dataGridView2.Columns.Count; i++)
{
if (m_CurFeatureLayer.FeatureClass.OIDFieldName == dataGridView2.Columns[i].Name)
row = i;
}
DataGridViewTextBoxCell textboxcell = (DataGridViewTextBoxCell)dataGridView2.Rows[pRow].Cells[row];
while (feature != null)
{
if (feature.OID == Convert.ToInt32(textboxcell.Value.ToString()))
break;
feature = feaCursor.NextFeature();
}
pMemoryStream = (IMemoryBlobStreamVariant)feature.get_Value(feature.Fields.FindField("ZDTP"));
object obj;
pMemoryStream.ExportToVariant(out obj);
byte[] img;
img = (byte[])obj;
MemoryStream memoryStream = new MemoryStream(img);
image = Image.FromStream(memoryStream);
memoryStream.Close();
viewer = new Viewer(image);
viewer.Show();
}