基礎知識

屬性域基礎知識
屬性域工具箱

ArcEngine操作

常用介面

IDomain、ICodedValueDomain、ICodedValueDomain2、IRangeDomain

建立編碼域（coded value domains）

//將Workspace物件轉換到IworkspaceDomains介面
IWorkspaceDomains workspaceDomains = (IWorkspaceDomains)workspace;
// 建立編碼域
ICodedValueDomain codedValueDomain = new CodedValueDomainClass();
 

// 新增編碼
codedValueDomain.AddCode("RES", "Residential");
codedValueDomain.AddCode("COM", "Commercial");
codedValueDomain.AddCode("IND", "Industrial");
codedValueDomain.AddCode("BLD", "Building");
// 移除編碼
codedValueDomain.DeleteCode("BLD"); // The "Building" code is removed.
// 將ICodedValueDomain物件轉換到IDomain物件上，設定通用屬性
IDomain domain = (IDomain)codedValueDomain;
 

domain.Name = "Building Types";
domain.FieldType = esriFieldType.esriFieldTypeString;
domain.SplitPolicy = esriSplitPolicyType.esriSPTDuplicate;
domain.MergePolicy = esriMergePolicyType.esriMPTDefaultValue;
// 新增Domain到工作空間中
workspaceDomains.AddDomain(domain);

建立範圍域（range domains）

// 將Workspace物件轉換到IworkspaceDomains介面
 

IWorkspaceDomains workspaceDomains = (IWorkspaceDomains)workspace;
// 建立範圍域
IRangeDomain rangeDomain = new RangeDomainClass();
rangeDomain.MinValue = 0;//設定最小值
rangeDomain.MaxValue = 255;//設定最大值
//將IRangeDomain物件轉換到IDomain物件上，設定通用屬性
IDomain domain = (IDomain)rangeDomain;
domain.Name = "EightBitUnsignedInt";//設定Domain名稱
domain.FieldType = esriFieldType.esriFieldTypeInteger;//設定Domain的欄位型別
domain.SplitPolicy = esriSplitPolicyType.esriSPTDuplicate;//設定Domain的分割策略
domain.MergePolicy = esriMergePolicyType.esriMPTAreaWeighted;//設定Domain的合併策略
//新增Domain到工作空間中
workspaceDomains.AddDomain(domain);

開啟值域

IWorkspaceDomains workspaceDomains = (IWorkspaceDomains)workspace;
IDomain requestedDomain = workspaceDomains.get_DomainByName(domainName);

刪除值域

IWorkspaceDomains workspaceDomains = (IWorkspaceDomains)workspace;
workspaceDomains.DeleteDomain(domainName);

#

修改值域

//修改Domain的屬性
......程式碼略
//修改完，呼叫AlterDmoain方法儲存修改
IWorkspaceDomains2.AlterDomain(pDomain);

在欄位上應用值域

// For example: domainName = "Material".
// fieldName = "CP_MATERIAL".
public void AssignDomainToField(IFeatureClass featureClass, String domainName,String fieldName)
{
    // Cast the feature class to IDataset to get a reference to the workspace.
    IDataset dataset = (IDataset)featureClass;
    // Get the workspace and cast it to the IWorkspaceDomains interface and get the requested domain.
    IWorkspace workspace = dataset.Workspace;
    IWorkspaceDomains workspaceDomains = (IWorkspaceDomains)workspace;
    IDomain domain = workspaceDomains.get_DomainByName(domainName);
    // Get the field to assign the domain to.
    IFields fields = featureClass.Fields;
    int fieldIndex = featureClass.FindField(fieldName);
    IField field = fields.get_Field(fieldIndex);
    // Check that the field and domain have the same field type.
    if (field.Type == domain.FieldType)    
    {
        // Cast the feature class to the ISchemaLock and IClassSchemaEdit interfaces.
        ISchemaLock schemaLock = (ISchemaLock)featureClass;
        IClassSchemaEdit classSchemaEdit = (IClassSchemaEdit)featureClass;
        // Attempt to get an exclusive schema lock.        
        try        
        {
            // Lock the class and alter the domain.
            schemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);
            classSchemaEdit.AlterDomain(fieldName, domain);
            Console.WriteLine("The domain was successfully assigned.");        
        }
        catch (Exception exc)        
        {
            // Handle the exception in a way appropriate for the application.
            Console.WriteLine(exc.Message);        
        }
        finally
        {
            // Set the schema lock to be a shared lock.
            schemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
        }
    }
    else
    {
        Console.WriteLine("The field and the domain have different field types: " + 
            "Field = {0}, Domain = {1}", field.Type, domain.FieldType);    
    }
}