excel-to-rvt

# Excel to RVT Import

> **Note:** RVT is the file format. Examples may reference Autodesk® Revit® APIs. Autodesk and Revit are registered trademarks of Autodesk, Inc.

## Business Case

### Problem Statement
External data (costs, specifications, classifications) lives in Excel but needs to update Revit:
- Cost estimates need to link to model elements
- Classification codes need assignment
- Custom parameters need population
- Manual entry is slow and error-prone

### Solution
Automated import of Excel data into Revit using the DDC ImportExcelToRevit tool and Dynamo workflows.

### Business Value
- **Automation** - Batch update thousands of parameters
- **Accuracy** - Eliminate manual data entry errors
- **Sync** - Keep external data in sync with model
- **Flexibility** - Update any writable parameter

## Technical Implementation

### Methods
1. **ImportExcelToRevit CLI** - Direct command-line update
2. **Dynamo Script** - Visual programming approach
3. **Revit API** - Full programmatic control

### ImportExcelToRevit CLI

```bash
ImportExcelToRevit.exe <model.rvt> <data.xlsx> [options]
```

| Option | Description |
|--------|-------------|
| `-sheet` | Excel sheet name |
| `-idcol` | Element ID column |
| `-mapping` | Parameter mapping file |

### Python Implementation

```python
import subprocess
import pandas as pd
from pathlib import Path
from typing import Dict, Any, List, Optional, Tuple
from dataclasses import dataclass
import json


@dataclass
class ImportResult:
    """Result of Excel import to Revit."""
    elements_processed: int
    elements_updated: int
    elements_failed: int
    parameters_updated: int
    errors: List[str]


class ExcelToRevitImporter:
    """Import Excel data into Revit models."""

    def __init__(self, tool_path: str = "ImportExcelToRevit.exe"):
        self.tool_path = Path(tool_path)

    def import_data(self, revit_file: str,
                    excel_file: str,
                    sheet_name: str = "Elements",
                    id_column: str = "ElementId",
                    parameter_mapping: Dict[str, str] = None) -> ImportResult:
        """Import Excel data into Revit."""

        # Build command
        cmd = [
            str(self.tool_path),
            revit_file,
            excel_file,
            "-sheet", sheet_name,
            "-idcol", id_column
        ]

        # Add mapping file if provided
        if parameter_mapping:
            mapping_file = self._create_mapping_file(parameter_mapping)
            cmd.extend(["-mapping", mapping_file])

        # Execute
        result = subprocess.run(cmd, capture_output=True, text=True)

        # Parse result (format depends on tool)
        return self._parse_result(result)

    def _create_mapping_file(self, mapping: Dict[str, str]) -> str:
        """Create temporary mapping file."""
        mapping_path = Path("temp_mapping.json")
        with open(mapping_path, 'w') as f:
            json.dump(mapping, f)
        return str(mapping_path)

    def _parse_result(self, result: subprocess.CompletedProcess) -> ImportResult:
        """Parse CLI result."""
        # This is placeholder - actual parsing depends on tool output
        if result.returncode == 0:
            return ImportResult(
                elements_processed=0,
                elements_updated=0,
                elements_failed=0,
                parameters_updated=0,
                errors=[]
            )
        else:
            return ImportResult(
                elements_processed=0,
                elements_updated=0,
                elements_failed=0,
                parameters_updated=0,
                errors=[result.stderr]
            )


class DynamoScriptGenerator:
    """Generate Dynamo scripts for Revit data import."""

    def generate_parameter_update_script(self,
                                         mappings: Dict[str, str],
                                         excel_path: str,
                                         output_path: str) -> str:
        """Generate Dynamo Python script for parameter updates."""

        mappings_json = json.dumps(mappings)

        script = f'''
# Dynamo Python Script - Excel to Revit Parameter Update
# Generated by DDC

import clr
import sys
sys.path.append(r'C:\\Program Files (x86)\\IronPython 2.7\\Lib')

clr.AddReference('RevitAPI')
clr.AddReference('RevitServices')
clr.AddReference('Microsoft.Office.Interop.Excel')

from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
from Autodesk.Revit.DB import *
import Microsoft.Office.Interop.Excel as Excel

# Configuration
excel_path = r'{excel_path}'
mappings = {mappings_json}

# Open Excel
excel_app = Excel.ApplicationClass()
excel_app.Visible = False
workbook = excel_app.Workbooks.Open(excel_path)
worksheet = workbook.Worksheets[1]

# Get Revit document
doc = DocumentManager.Instance.CurrentDBDocument

# Read Excel data
used_range = worksheet.UsedRange
rows = used_range.Rows.Count
cols = used_range.Columns.Count

# Find column indices
headers = {{}}
for col in range(1, cols + 1):
    header = str(worksheet.Cells[1, col].Value2 or '')
    headers[header] = col

# Process rows
TransactionManager.Instance.EnsureInTransaction(doc)

updated_count = 0
error_count = 0

for row in range(2, rows + 1):
    try:
        # Get element ID
        element_id_col = headers.get('ElementId', 1)
        element_id = int(worksheet.Cells[row, element_id_col].Value2 or 0)

        element = doc.GetElement(ElementId(element_id))
        if not element:
            continue

        # Update mapped parameters
        for excel_col, revit_param in mappings.items():
            if excel_col in headers:
                col_idx = headers[excel_col]
                value = worksheet.Cells[row, col_idx].Value2

                if value is not None:
                    param = element.LookupParameter(revit_param)
                    if param and not param.IsReadOnly: